hello. again ^^

A: Do you have any idea what time it is?

B: No, ______________ my watch today.

(a) I haven't worn

(b) I'm not wearing

I understand (b) is correct answer. but I think (a) may be possible.

If I say (a), what dose it mean?

is it different from (b)?

please help T.T
Hi LeeSang

Yes, (b) is possible as a response, but (a) is not.

"I haven't worn my watch today" is not a sentence I would expect to hear in any conversation. It suggests that although you did not put your watch on earlier today (and thus are not wearing it now) you might possibly put your watch on later today and then wear it for a while.
LeeSangI understand (b) is the correct answer. but I think (a) may be possible.
The present perfect is used for an action that started at some time in the past, and continues to the present.
For example: I have not worn my watch since last week, because its battery needs to be replaced.
When there is no time stated that indicates when the action started, we use the present progressive.
I cannot tell you what time it is because I am not wearing my watch today.
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thanks for kind reply. thank you all ^^
Hi all,

could you please clarify me about question related to this topic.

I found an example with present perfect in the textbook.

"It hasn't rained this week."

Can I say "It isn't raining this week" ? Is this grammatically right?

If yes, what is the difference between this two sentences?

These two sentenses conform both rules on the picture.

Welcome to the Forum!
This is a tricky question! Grammatically, it is OK, but logically it sounds a bit weird.
You can say: I'm not working this week, I'm on holiday.This means during the whole week you haven't worked, you are not working, and you will not work. You know this for sure.

It isn't raining this week means that you know for sure that it will not rain the rest of the week. Since we can't predict the weather with this certainty, we do not use this expression. On the last day of the week, we would say, It hasn't rained this week. (past time).
It is OK to say: It isn't raining today. or It hasn't rained today - because we can see what the weather will be for just one day.

It's not going to rain this week. (This is usually as prediction from the weatherman, or your hope.) I hope it's not going to rain this week, because that would spoil my vacation.
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AlpheccaStars, thank you for detailed explanation.