They can have arrived (by) now. They could have arrived (by) now. They may have arrived (by) now. They might have arrived (by) now. Could or might suggest somewhat more uncertainty …
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 …
更多内容请点击："Could have" and "can have" in a sentence using the present tense