题目内容：

It’s a good idea to have a check-up with the dentist every six months.
请问此句是怎么样拆分的呢?

优质解答

it's a good idea//to have a check-up /with the dentist/every six months.你可以这样看：to have a check-up with the dentist every six months is a good idea.it 指代 to 后面的内容,也就是形式主语；...