+0

All my friends do not know the English language.

Does the sentence mean that most of his friends can speak and write it very well?

+0
anonymous

All my friends do not know the English language.

This is the kind of faulty sentence you get whenever you use a universal quantifier in the subject position (all, both, ...) with a verb under negation, thus:

All ... do not ...

To correct it you must choose between these:

Only some ... do / Not all ... do ... (same meaning)
None ... do ...

So for your example that's these:

Only some of my friends know English.
Not all of my friends know English.
None of my friends know English.

CJ

Comments  
anonymous

All my friends do not know the English language.

Does the sentence mean that most of his friends can speak and write it very well?

No, it means that none of his friends know English, but it is a rather back-to-front way of putting it. If he says "Not all my friends know English", that means that some of them do, probably most of them.

 CalifJim's reply was promoted to an answer.