Hi, "He hasn't studied English for a week." This means........
a-He didn't study it for a week.
b-He didn't study it last week.
c-He didn't study it a week ago.
d-It's a week since he last studied it.
Hi, Ahmed.A.A—The sentence can mean either (b) or (d), but the most likely meaning (if we imagine the most likely context for the sentence) is (d). In other words, if it is Tuesday, the sentence "He hasn't studied English for a week" would mean "He hasn't studied English since last Tuesday."
If the meaning were (a)—i.e., if it were a response to the question "Who hasn't studied English for an entire week at some point in his or her educational career?"—it would likely be phrased different: "He has gone a week without studying English."
Interestingly, if, in your culture, the week begins on Sunday (as it does, technically, in the United States), then it would be possible for the sentence "He hasn't studied English for a week" to imply (b) ("He didn't study it last week") if, and only if, the sentence were uttered on Sunday.
1-Is the same when we say "He has studied English for a week."? If today were Tuesday, does it mean that he has studied English since last Tuesday? or it may refer to an unkown period of time too?
"He has studied English for a week" may mean either (i) that he has studied English for the last week or (ii) that there has been a one-week period of time—perhaps a month ago, perhaps twenty years ago—during which he studied English for one week. Meaning (i) is by far the likelier meaning of the two.
2-What is the meaning of (C): "He didn't study it a week ago."?
"He didn't study English a week ago" means that, one week ago, it was not the case that he studied English. This could imply either that he missed an English study session a week ago or that he had never studied English at all a week ago or at any time in his life prior to a week ago.
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