Modal verb: should

I think we should watch this movie = It’s a right thing to watch this movie.
You should not believe the news = It’s not a good idea to believe the news.

Usage: We use ‘should’ or ‘should not’ to say that something is a good or bad thing to do.

Where is she? She should be here by now = This is not normal that she is not here yet.
It shouldn’t be so hard to find her = It’s not expected to be hard to find her.

Usage: We use ‘should’ or ‘should not’ when something is not right or what we expected.

should have done
You should have come. Why didn’t you? = You didn’t come, but it would have been right if you did.
You shouldn’t have eaten so much = You ate too much but it was wrong thing to do.

‘should have done’ is the past form of modal verb ‘should’

We can use ‘ought to’ instead of ‘should’ You ought to watch this movie = You should watch this movie.

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