Perhaps he telephoned last night,but I'mnot sure.不好意思 Perhaps he telephoned last night,but I'mnot sure 这句话还可以说 he may have telephoneed last night,but I'mnot sure.为什么后一句话中may后要加have。

Perhaps he telephoned last night,but I'mnot sure.
不好意思
Perhaps he telephoned last night,but I'mnot sure 这句话还可以说 he may have telephoneed last night,but I'mnot sure.
为什么后一句话中may后要加have。

也许他昨晚打电话了,但我不确定.

病句, 至少2处错误吧

have+动词-ed形式是现在完成式，表示已经完成的动作。

完成时好像可以加强语气