Can do it?

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Nobody cans do it alone without the support from friends.

2.Nobody can does it alone without the support from friends.

3.Nobody can do it alone without the support from friends.

Which is the gramatically correct sentence? Please expain.

2
  1. It is the only correct form because the verb is ‘can’.

I can do
you can do
they can do
we can do

Where the verb is ‘does’ (no ‘Can’) then the form is as you suggest:
Nobody does…

3

Nobody, everybody, somebody are singular

If nobody does their homework, then nobody cans eat dinner.

4

The verb can doesn’t have a form with ‘s’. Nobody can eat dinner. (not ‘cans’)[YSaerTTEW443543]

TOEFL listening lectures: A lecture from an arts class[YSaerTTEW443543]

5

Unfortunately that’s not the case with the modal verb “can”.
We say “he can/she can/you can”, etc. In a way, it’s immutable.

But, if by “can” you mean “fire”, then you can say:
He cans people for the slightest infractions.

@ Torsten: we posted at the same time, I didn’t see your post :)))