I found the following sentences as some of the sentences that confuse a lot of ELL, and I, as a part of them, would like to understand them correctly.
"He didn't do nothing."
Means that he did something (minus+minus=plus). Correct?
"He did nothing".
Means that he didn't do something. This a correct sentence?
"He didn't do something at all."
Simply understood that it is the same as saying "he did 0".
"He didn't do anything." Here I have another big confusion. Once I've been told that it means that the man didn't do anything in world but something he did. But in other time I was told that the meaning is as the same as He didn't do something at all. This sentence can be said when someone suspected but we say about him that "He didn't do anything." or alternatively when complaining about someone that he didn't work at all.