Mandarin Has No Past Tense: 7 English Tense Mistakes Chinese Speakers Make in Interviews
Here is the sentence I hear in almost every interview practice with a Chinese candidate: 'Last year I work at Huawei.' The time word is perfect. The verb is naked. That is not laziness, it is Mandarin doing exactly what Mandarin does. Your verbs never change shape for time. You say zuotian (yesterday) or wo qu le (I went, with le), and the verb 'qu' stays 'qu' forever. English makes the verb itself carry the past: work becomes worked, go becomes went. Because Mandarin encodes time on time words and aspect particles rather than on the verb, the verb ending is the easy thing to drop. In an interview this matters, because the whole point is talking about what you DID. An interviewer who hears present-tense verbs about your past job can be left unsure whether the job is finished. Below are seven mistakes that come straight from Mandarin's aspect system, and the small habit that fixes each one. Read them out loud. The fix is muscle, not theory.
✗ Last year I work at a startup in Shenzhen.
✓ Last year I worked at a startup in Shenzhen.
Why In Mandarin, 'qunian wo zai Shenzhen gongzuo' uses the time word qunian to set the past, and the verb gongzuo never changes. You correctly add 'last year' but leave the English verb in its dictionary form, because that is all your L1 ever required.
Treat the time word as a trigger, not a finish line. Any time you say 'last year', 'in 2019', 'when I was at...', immediately add -ed or grab the irregular form. The time word and the verb both have to point to the past in English.
✗ I already finish the project before I leave.
✓ I had already finished the project before I left.
Why Mandarin marks completion with le, not with a tense. 'Wo yijing wancheng le' just means 'completed, done.' There is no grammatical past-before-past, so the idea of 'finished earlier than another past action' has no verb form attached to it in your head.
For 'this happened before that other past thing', use had + past participle for the earlier one: had finished. Picture le becoming 'had + -ed' when two past events stack up.
✗ Have you ever work in a foreign company?
✓ Have you ever worked in a foreign company?
Why Your guo (as in 'qu guo', have been) signals past experience perfectly, but it sits next to an unchanged verb. So when you borrow English 'have ever', you forget that English also demands the participle form (worked), not the base verb.
The guo experience meaning maps onto 'have/has + past participle'. After have/has, the verb is never the plain form: have worked, have seen, have done. If you started with 'have', you cannot end with 'work'.
✗ When the manager called, I write the report.
✓ When the manager called, I was writing the report.
Why Mandarin shows an ongoing action with zai ('wo zai xie baogao', I am in the middle of writing), and this zai does not change for past or present. So a past 'in-progress' action comes out as a bare or present verb in English.
Past zai equals was/were + -ing. 'I was writing', 'they were testing'. Use it for the background action that was already running when something else interrupted.
✗ I work here since 2020.
✓ I have worked here since 2020.
Why Mandarin says 'wo cong 2020 nian kaishi zai zheli gongzuo', a flat verb plus 'cong' (since). There is no separate form for an action that started in the past and continues now, so you reach for the simple present 'work'.
'Since' plus a start point in the past almost always wants 'have/has + past participle': have worked, have lived. It tells the interviewer the job is still going. 'I worked here since 2020' sounds like you already quit.
✗ Yesterday the client didn't accepted our proposal.
✓ Yesterday the client didn't accept our proposal.
Why This is overcorrection. Once Mandarin speakers learn English wants -ed for the past, some stamp it everywhere, even after 'did'. Mandarin negates with mei ('mei jieshou', didn't accept) and the verb stays plain, so there is no native sense of where the past 'lives' in the sentence.
The past tense can only sit in ONE place. If 'did' or 'didn't' carries it, the main verb goes back to plain form: didn't accept, did you go. One past marker per verb, never two.
✗ I'm working at Alibaba for three years, then I move to Beijing.
✓ I worked at Alibaba for three years, then I moved to Beijing.
Why Because Mandarin keeps one verb shape, a whole story comes out in one flat tense. 'Wo zai Alibaba gongzuo san nian, ranhou qu Beijing' has no tense shifts at all, so the English narrative stays stuck in present or present continuous.
When you tell a finished story (a past job, a finished project), set every verb to past and keep it there: worked, then moved, then led. Decide 'this whole answer is about the past' before you open your mouth, then commit all verbs to it.
Common questions
Why do I keep forgetting -ed even when I know the rule?
Because Mandarin verbs never change for time, you have spent years not listening for verb endings. Knowing the rule lives in one part of your brain; speaking happens in another. The fix is reps out loud, not more theory. Say five past-tense sentences about your last job every morning until the -ed comes automatically.
Is 'le' the same as English past tense?
No, and this trips up almost everyone. le marks completion or change, not past time. You can use le about the future: 'mingtian wo jiu zou le' (tomorrow I'll leave). So do not assume every le sentence becomes English past tense. Decide the actual time first, then choose the English form.
Which is worse in an interview, wrong tense or hesitation?
Consistent wrong tense is worse, because it makes a finished achievement sound unfinished or uncertain. 'I lead a team of ten' sounds like maybe you still do, maybe you do not. 'I led a team of ten' is a clean, confident fact. A short pause to grab the right verb form is fine; nobody penalizes thinking.
Do I really need the past perfect (had done) to sound good?
For B1 you can survive without it. For B2 and competitive interviews, one or two 'had finished before...' sentences show range. But do not overuse it. Most of your past story should be simple past (worked, built, fixed), with had + past participle only when two past events clearly stack.
Sources
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