Which one is correct sentence?

It seems that you may be using brackets ( ...) to highlight portions of text. This is confusing. Brackets are not suitable for this purpose. Instead you can use bold text, like this.

I don't understand why you have made "Now" a one-word sentence. This is not correct in this context. You can say:

It was broken, but it's OK now. It has / It's been repaired.
It

Thanks, but my computer are very old, so I can't used above buttons. Sorry. I can't help myself.

And in your answer at "It's been repaired", Did you mean this? "It has been repaired".

Carter LeeThanks, but my computer are very old, so I can't used above buttons. Sorry. I can't help myself.

If you can't operate the buttons, you can create bold text by enclosing the text within a pair of asterisks, *......*. Do not put a space after the opening asterisk or before the closing asterisk.

If all else fails, doing nothing is better t

Did you mean like this? It has been repaired are same like this it's been repaired.

Carter LeeDid you mean like this? It has been repaired = it's been repaired

This is what I wrote:

It has / It's been repaired.

This is a shorthand way of showing that there are two possibilities:

It has been repaired.
It's been repaired.

"It's" is a contraction of "It has". It is very common in spoke

So you mean that I can use like this.
It has repaired. And It has been repaired.

GPY"It's" is a contraction of "It has". It is very common in spoken English.

Of course, in another context "it's" can also be a contraction of "it is".