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?

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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?

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;