can

[Progress]

As it is raining, I think they ( ) have stayed at home.
A. can B. must

I know must is correct. But whe is can wrong?

Thank you very much.

[matilda]

you know , can is not grammatically wrong. but can you find a relevant and good meaning by translating it into your language?

the meaning makes a bad sense in reader or listener.

[Progress]

Thanks matilda

[Dextrous]

Can would work fine only if you put it into the past tense -> could

Alternatively, you can use may have or might have

[Harry Smith]

As it is raining, I think they ( ) have stayed at home.
A. can B. must

I know must is correct. But whe is can wrong?

Thank you very much.

Where have you taken that sentence. "Must have stayed " doesn't seem correct to me.

[Progress]

Thanks Dextrous and Harry

It comes from a unversity exam in Japan.

[Progress]

I think the sentence should be
As it is raining, they must be staying/ stay at home.

What would you think?

[Harry Smith]

I think the sentence should be
As it is raining, they must be staying/ stay at home.

What would you think?

Yes! That's why I asked about "must have stayed" because "must stay" is more correct. I'd say "As it's raining you'd better stay in".

[Humble]

Hi,
They must have stayed is perfectly correct. It expresses certainty abt a fact in the past.
In other words, I am sure they have not come because it is raining.