+0
Affirmative: They will/would have arrived home by now.
Negative: They won't/wouldn't have arrived home by now.

Affirmative: He will/would have reached New York.
Negative: He won't/wouldn't have reached New York.

I was trying to change the affirmative sentences into negative ones. Could you please check them out for me and see if they are right? Thank you very much!
+0
They seem fine to me. "wouldn't have arrived home yet" is also very common.
Comments  
Teachers: We supply a list of EFL job vacancies
change into negative and introgative

she`has rubbed the board

you must have locked the doors
Anonymouschange into negative and introgative
she`has rubbed the board
you must have locked the doors
simultaneously?

Hasn't she rubbed the board?

Could you have not locked the doors?