用WHO 提问 一定三单吗
例如：They are going to plant trees next week. They划线提问。Who is going to plant trees next week?还是Who are going to plant trees next week?哪句对？谢谢大家！

都对。。。。。。。。。。

好像都可以。

我感觉跟What's in/on the ...?一样，问句是单数，答句单复数都可以。

我也觉得问的时候用单数吧！！！！！！！！！！！

感觉好像都没错

如：Who runs fast?  问的时候是单数，答的时候根据实际情况。

跟What's in/on the ...?一样，问句是单数，答句单复数都可以。