I don't know what to say at the meeting (用John代替句子主语)

问题描述:

I don't know what to say at the meeting (用John代替句子主语)

John does not know what to say at the meeting.
助动词与人称代词的搭配问题如下图:
人称代词IYou He / She / ItWe / You / They一般现在时dododoesdo一般过去时did

希望能帮到你,谢谢!