who did you go with.what are those trays made of.为什么一个用do提问一个用are呢?go with 和made of 不是都是动词吗?

Question

who did you go with.what are those trays made of.为什么一个用do提问一个用are呢?
go with 和made of 不是都是动词吗?

Answer 1

因为 Who did you go with? 里面的 go 是主动语态,一般过去时.
用完整的句子回答,是：
I went with Xiao Ming.
此类陈述句改成疑问句,要加 do 的适当形式.
而 what are those trays made of? 里面的be made of,是被动语态,一般现在时.
用完整的句子回答,是：Those trays are made of plastic.
此类陈述句改成疑问句,要把 be 动词提前.