How much costs it? Why French speakers forget do and does in English questions
If you keep producing English questions like "How much costs it?" or "What means this word?", the cause is almost always French. French builds questions by inversion (Aimez-vous le café?) or by intonation (Vous aimez le café?), and it has no auxiliary like English do/does. English needs that auxiliary in almost every question and negative: Do you like coffee?, How much does it cost?, I don't know. The fix is one reusable frame: do / does / did + subject + base verb. Get that frame automatic and the whole error class disappears at once.
✗ How much costs it?
✓ How much does it cost?
Why French asks with inversion and no auxiliary: Combien coute-t-il? (literally 'How much costs-it?'). You are translating that inverted structure straight into English, where the main verb cannot lead.
Use the do-support frame: wh-word + do/does/did + subject + base verb. How much + does + it + cost = How much does it cost? Note the verb drops the -s: not costs, just cost, because does already carries it.
✗ What means this word?
✓ What does this word mean?
Why This is a word-for-word copy of Que veut dire ce mot? / Qu'est-ce que ce mot veut dire?, where French puts the verb before the subject and uses no auxiliary.
Insert does and move the base verb to the end: What + does + this word + mean = What does this word mean? Same frame: do/does + subject + base verb (mean, not means).
✗ You like coffee? / Like you coffee?
✓ Do you like coffee?
Why French makes yes/no questions either by intonation alone (Vous aimez le cafe?, same word order as a statement) or by inversion (Aimez-vous le cafe?). Both transfer directly: intonation gives You like coffee?, inversion gives Like you coffee?. Neither uses an auxiliary, so do goes missing.
Open with Do/Does: Do you like coffee?. For he/she/it switch to does: Does she like coffee? (not Does she likes). The auxiliary at the front is what makes it sound like a real English question.
✗ Where you work? / Where work you?
✓ Where do you work?
Why Built on the French wh- patterns Ou travaillez-vous? (inversion) or Ou tu travailles? (intonation). With no do in French, the English version either keeps statement order (Where you work?) or inverts the main verb (Where work you?).
Slot do/does/did in after the question word: Where do you work?, Where does he work?, Where did you work? The question word changes, the do-support frame stays the same.
✗ I know not. / She agrees not.
✓ I don't know. / She doesn't agree.
Why French negates by wrapping the verb in ne ... pas (Je ne sais pas, Elle n'est pas d'accord), so the negative word lands after the verb. Calqued into English that becomes I know not, an old form no living speaker uses.
Negatives use the same auxiliary as questions: do/does/did + not + base verb. I + don't + know = I don't know; She + doesn't + agree = She doesn't agree. Master do-support once and it fixes your questions and your negatives together.
Common questions
Why do French speakers say 'How much costs it?' in English?
Because that is the literal French structure. French asks 'Combien coute-t-il?' using inversion (verb before subject) with no auxiliary, so the word-for-word result is 'How much costs it?'. English does not invert the main verb; it uses do-support: 'How much does it cost?' (does + it + base verb cost).
When do I use do, does, or did in an English question?
Use does with he/she/it (third person singular present): 'Does she work here?'. Use do with I/you/we/they: 'Do they work here?'. Use did for any subject in the past: 'Did she work here?'. After all three, the main verb stays in its base form: work, not works or worked.
Why is 'I know not' wrong for 'I don't know'?
French negates by surrounding the verb (je ne sais pas), so 'I know not' is a calque of that pattern. English negates with the same do auxiliary as questions: do/does/did + not + base verb. So it is 'I do not know' / 'I don't know', never 'I know not' (which only survives in old or poetic English).
Keep practising
Sources
- Learner English: A Teacher's Guide to Interference and other Problems (French speakers chapter), Swan, M. & Smith, B. (eds.), Cambridge University Press. French forms questions by inversion (verb-subject) or by intonation and uses 'est-ce que' as a question marker, with no do/does auxiliary equivalent to English. This L1 pattern transfers into French speakers' English.
- Structure: Formation des questions (French OER 1), Humanities LibreTexts. French yes/no and wh- questions are formed by inversion (Habite-t-elle a Paris?), by rising intonation (Tu habites a Paris?), or with est-ce que, none of which use an auxiliary 'do'.
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