Modal forms

[henryh]

Hello,

Can a perfect modal refer to future as well? Is it correct to say a sentence like this?

'By the time I come home tomorrow, you should have been doing the cleaning for an hour.'

If not, how would it be possible to express this with a modal form: when I come home, I want to see that you will have been working for two hours.

Thanks a lot.

[Buddhaheart]

I can’t say I see anything wrong with your 1st sentence.

[susiedqq]

'By the time I come home tomorrow, you should have been cleaning for an hour.'

Reminds me of what I used to tell my kids -

"By the time I get home, that room better be clean."