题目内容：

为什么是How long do you think it will be ...
do you think 不是插入语吗?原来不是How long will it be.

优质解答

没错,do you think 是插入语,插入语后接陈述句语序,所以用How long do you think it will be ...,如果没有插入语,就是像你所说的How long will it be.