英语题(补全对话）

A:Look!There is someone stabding over there.Who could it be?
B:It might/may be Mr.Green ,but I'm not sure. (口语里两种说法都有人用)
A:How do you know that?
B:He told me that he would come today.
A:Then it must be him.The man seems to be waiting for someone.
B;yes

:Look!There is someone standing over there.Who _can____ it be?
看, 那边站着个人.会是谁呢? 记得<<悲惨世界>>里神父听到教堂内有动静的时候遥空问的一句话, 当时是男主角在偷东西
B:It _may____ beMr.Green ,but I'm not sure.
可能是格林先生吧.我也不能确定
A:How __could___you know that?
你怎么知道的.一般疑问句中用"could"更委婉
B:He told me that he ___would__ come today.
他曾告诉我今天他会来. 是从句在主句为过去式的情况下由"will"变成" would"
A:Then it __must___ be him.The man seems to be waiting for someone.
那么肯定是他了.他好象是在等谁
B;yes
是的(同意)

A:Look!There is someone stabding over there.Who (may) it be?
B:It (may )beMr.Green ,but I'm not sure.
A:How (do ) you know that?
B:He told me that