and "There is no way he can have known the location of the safehouse without the help of the inside." Note that both of these sentences involve negation. With can + been + negation, …
“Have you any work, sir?” was repeated in a still lower and more timid voice than that in which her request had at first been made. “Yes, we have,” was the gruff reply. “Can I get some?” And …
2. The basic format for asking a question is like this: "Wh" (words) + Auxiliary verb + subject + verb + object + ? or. Auxiliary verb + subject + verb + object + ? So according to this formula, …
*They can have been so drunk that they didn't notice their car had been stolen. (pred adj) *They can have been doctors; they weren't wearing nurse's uniforms. (pred noun) *It can have …
When talking about possibilities in the past, You often use "could have done". "She could have gone to the theatre with him." "He couldn't have done such a thing!" "I could have saved them." …
更多内容请点击：Do we use "can have" + past participle for past possibility?