Student or Learner
Which one is correct?
1. It's been a week since I did not use shampoo.
2. It's been a week since I have not used shampoo.
Many thanks for your help.
I find they are both wrong. Not using something is not an act, but a non-act, so you can't really shoot a starting gun at a non-act.
So, I's suggest:
It's been a week since I stopped using shampoo.
I haven't used shampoo for a week.
It's been a week since I [last] used shampoo.
(1) If I understand my books correctly, you might wish to say:
It has been a week since I have last used shampoo.
It is a week since I have last used shampoo.
(P. S. One book agrees with another poster. Instead of the
"correct" present perfect, that book says the past tense is
It has been/is a week since I last used shampoo.)
(Sorry if this is unrelated!)
"It's a week that I've been studying."
"It's been a week that I've been studying."
"It's been a week that I'm studying."
Is anything wrong with the second and third sentences?
(1) I have been unable to find a direct answer to your question.
(2) So I shall present some information. Then we can make an educated
(3) Professor George O. Curme wrote an authoritative two-volume
grammar entitled A Grammar of the English Language.
(a) He says that we use since when we wish to indicate that the action
is past; we use that when we indicate that the action is still continuing.
(i) His since example is: It is (or has been) a long time since I have seen
him. [I read on the Web someone's opinion that has been may be an
older expression. I notice that Professor Curme did put has been in
parentheses, as if to say: is is more common, but has been is also
(ii) His two that examples are:
It is now four years that I have studied.
It is now four years that I have been studying.
(4) Based on the expert evidence above, I shall offer my guess --
which, of course, could be 100% wrong. Maybe your guess will be
In my opinion, I think that the following versions of your sentence
would be "good" English:
It is a week that I have studied.
It has been a week that I have studied.
It is a week that I have been studying.
It has been a week that I have been studying.
(I believe that It is/has been a week that I am studying is not
"correct." The present progressive does not seem to fit.)
(5) Hopefully a teacher will either confirm or refute my analysis.