Why do Spanish speakers make these mistakes in English?
It is not lack of intelligence or effort: it is "linguistic interference" — the brain automatically applies Spanish rules to English. That is why we say "I have 30 years" (from "tengo 30 años") or "She don't know" (Spanish negation never changes with the person). It is fixed by building new automatic responses through repeated exposure to real English, not by memorising rules.
"I have 30 years." "She don't know." "I am agree." If you have ever said something like this, you are not alone — these are the most frequent mistakes Spanish speakers make when learning English, and they all share a common cause: Spanish.
We start with the practical part: the 15 mistakes fixed as cards — the correct phrase on the front, the typical mistake and its cause on the back, with native British audio. Then the theory: what linguistic interference is and what the science says about eliminating it at the root.
The 15 most common English mistakes — fixed
Each card shows the CORRECT phrase on the front. Tap it for the translation, a real-use example, the typical mistake, and why we make it.
Grammar
The five patterns where Spanish rules sneak into your English uninvited.
You will be asked for it at every registration: the GP, the council, an interview. Practise the short version too — "I'm 30" — the one natives use daily.
It comes up constantly when talking about colleagues or your manager on shift. Rehearse the pattern with your real sentences: "He doesn't work Fridays", "She doesn't like it".
Essential in meetings and with your landlord. Learn the correct negative too: "I don't agree" or "I disagree" — never "I am not agree".
You will need it to explain absences — to your manager, your kids' school, the GP. Rehearse your three most likely explanations out loud before you need them.
Key in interviews and medical appointments: "I've lived in London for two years", "I've had this pain for three days". Length of time → "for", always.
Vocabulary
Words and structures that seem to work like Spanish — until they don't.
The perfect phrase for small talk about your area or your job. The same plural applies to "the police are" and "staff are" — very frequent in the UK.
Beware of the reverse effect: saying "I'm boring" calls yourself dull. Before saying it, ask: am I talking about me (-ed) or about the thing (-ing)?
The same mould works for asking almost anything: "I need you to sign this", "I'd like you to check it". Master it and you gain ten phrases at once.
A go-to answer for plans in the UK — where everything depends on the weather, literally. On its own it works too: "It depends." is a complete, natural answer.
Note the British spelling: "favour", with a u. Learn the collocations as real pairs — "make a mistake", "do the shopping" — not as an abstract rule.
Pronunciation & rhythm
It is not your accent: it is the rhythm. English compresses what Spanish stretches.
The star word when flat-hunting or buying furniture. The card audio is your model: repeat it out loud three times in a row until it comes out in three syllables.
Also, "the" changes: "thuh" before a consonant ("the bus") and "thee" before a vowel ("the end"). Do not study it: listen to the card audio and copy it.
At work and at the pub, the contracted version is the neutral one; the full form sounds solemn or annoyed. When rehearsing phrases, rehearse them already contracted.
Mind the tone: a flat "I know" can sound curt in the UK. A smiling "Yes, I know — thanks!" softens it completely.
Quick rule for small talk: in general, no "the" — "I like dogs", "coffee is expensive". Use "the" only for something specific: "the music at that pub".
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Why you make these mistakes: linguistic interference
The root cause
These mistakes are not due to lack of intelligence. They are the result of applying Spanish rules to English — a phenomenon linguists call "linguistic interference." The solution is not to memorize new rules, but to build new automatic responses through repeated exposure to real English.
The science behind these mistakes
Half of the errors come from the native language
In contrastive analyses of student writing, around 50% of errors are "interlingual": caused by transfer from the native language, not by lack of study. Different studies place the figure between 51% and 58%.
Source: contrastive L1→L2 error-analysis studies (Journal of Language Teaching and Research; ResearchGate).
5 error types account for most of them
The five most frequent errors made by English learners are, in this order: articles, word choice, prepositions, word order and subject-verb agreement. They map exactly onto this guide’s categories: grammar, vocabulary and pronunciation.
Source: error analysis of English-as-a-second-language writing (ResearchGate, 2020-2021).
30-40% of shared vocabulary
English and Spanish share Latin roots: between 30% and 40% of English words have a recognisable Spanish cognate. That closeness helps comprehension, but it is also the direct source of the interference behind these mistakes.
Source: Applied Linguistics, Oxford Academic (academic.oup.com).
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Frequently asked questions
Why do Spanish speakers make so many mistakes in English?
The most frequent English mistakes Spanish speakers make are not due to lack of intelligence but to "linguistic interference": the brain automatically applies Spanish rules to English. For example, in Spanish we say "tengo 30 años" (using "tener"/"to have"), but in English the correct structure is "I am 30 years old" (using "to be"). The solution is not to memorise rules but to build new automatic responses through repeated exposure to real English.
What are the most common English mistakes Spanish speakers make?
The 15 most common mistakes fall into three categories: grammar (saying "I have 30 years" instead of "I am 30 years old"; "She don't know" instead of "She doesn't know"; "I am agree" instead of "I agree"; confusing "for" and "since"); vocabulary (confusing "people is" with "people are"; "bored" with "boring"; using "want that" instead of "want to"); and pronunciation (pronouncing "comfortable" with 4 syllables, saying "ze" for "the", avoiding contractions, and using articles with generalisations).
How do you fix the "I have 30 years" mistake in English?
The mistake "I have 30 years" comes from literally translating "tengo 30 años" from Spanish. In English age is always expressed with the verb "to be": "I am 30 years old" or simply "I'm 30". The verb "have" is not used for age in English. The fastest way to correct it is to listen to real conversations where native speakers talk about their age.
What is the difference between "for" and "since" in English?
"For" is used with durations: "I have been here for 3 hours". "Since" is used with a specific point in time: "I have been here since Monday". The most common mistake Spanish speakers make is using "since" with durations: "I have been here since 3 hours" — incorrect. The rule: "for + length of time", "since + specific moment".
Why is English pronunciation difficult for Spanish speakers?
English is a stress-timed language: unstressed syllables are compressed and reduced. Spanish, by contrast, gives equal weight to every syllable. This leads Spanish speakers to pronounce words like "comfortable" (3 syllables in real spoken English: COMF-ter-ble) as if they had 4. The most effective way to correct this is not to study phonetics but to listen to large amounts of native English.
How does NexSpeak help fix these English mistakes?
NexSpeak uses stories designed specifically for Spanish speakers where the most problematic structures appear repeatedly in natural context with native British audio. Instead of memorising rules, the brain absorbs the correct patterns through repeated exposure — the same mechanism that works for children learning a language. Spaced repetition flashcards then reinforce what the stories introduce.
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NexSpeak stories break these habits at the root
Studying a list of mistakes and their corrections helps at a conscious level. But in a real conversation the brain operates on autopilot. The only real antidote is having heard the correct form so many times that it comes out automatically.
NexSpeak stories are designed specifically for Spanish speakers. The most problematic structures — "I’m 30 years old", "She doesn’t know", "It depends on" — appear again and again in natural context, with native British audio, until the correct automatism replaces the incorrect one. Spaced-repetition flashcards then reinforce what the stories introduce.
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Conclusion: the problem is not your intelligence
The 15 mistakes in this guide are made by Spanish speakers at all levels — from beginners to people with years of formal study. They are not a sign of lack of effort. They are the predictable result of learning English from Spanish.
The difference between those who overcome them and those who do not is not grammar — it is the amount of real English they have listened to. The more comprehensible input, the faster the incorrect automatisms are replaced by the correct ones.
If what holds you back is not the mistake but the embarrassment of making it, continue with our guide on how to overcome the fear of speaking English — with 10 lifesaver phrases so you never go blank.
And if the office is where the stakes are highest, you have ready-made phrases for interviews, emails, and meetings in our guide to English for working in the UK.
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