Thanks in advance.

[zzang418lee]

I often saw 'can't have p.p' and 'could have p.p' but rarely saw 'can have p.p' just as 'must not have p.p' is not common. Could you tell me the reason?

 

[Raymott]

I often saw 'can't have p.p' and 'could have p.p' but rarely saw 'can have p.p' just as 'must not have p.p' is not common. Could you tell me the reason?

It would depend on the context and the meaning of 'p.p'.

What was your question about "Thanks in advance"?