I think the first should be Why hasn't he come to the party?
what are the differences between the two questions:
Why couldn't he has come to the party?
Why couldn't he come to the party?
Many thanks
I think the first should be Why hasn't he come to the party?
Red5
Webmaster, UsingEnglish.com
Re:
- Why hasn't he come to the party?
Meaning:
- "What is the reason he didn't go come the party?"
(He might have changed his mind about going.)
Re:
- Why couldn't he come to the party?
Meaning:
- "What prevented him from coming to the party?"
(Perhaps some urgent matter demanded his attention.)
:)