分裂句是以it為引導詞的強調句型。句型是這樣的：It is/was + 被強調部分(通常是主語、賓語或狀語)+ that/ who(強調主語且主語指人)+ 其他部分。例如說It was Jane that/who called thismorning.
那為什麼在口語答題中需要用到分裂句呢? 那是因為分裂句可以起到突出強調表達重點的效果，保持句子平衡，使答題的邏輯性更強，清晰易懂，也更符合西方人的思維習慣。
分裂句更能體現語法結構的多樣性，通常看到的很多答題範例都會有各種的高端句式，目的就是為了讓同學們通過學習掌握這些句式。
Q: Have you ever learnt any courses about stars and planets at school?
A: Yes, I have. It was actually my geography teacher who taught me about them. He was incredibly encouraging but quite strict, because he was convinced that these courses can provide us with basic knowledge that we should learn in order to better understand our universe.
在回答這道題時使用分裂句強調了是我的地理老師教我這些課程的。然後順理成章地進一步描述了為什麼他認為要學習這些課程。如果回答「Yes, I have. My geography teacher taught me about them.」，那顯然這道題的回答是不夠充分的。
Q: Who bought your clothes for you when you were a child?
A: When I was a kid, it was my parents who chose the clothes for me. When they noticed that I was short of clothes, they would take me to the stores in downtown areas, and picked out the clothes that would suit me most.
這裡使用分裂句避免了答題時再簡單重複問題，不讓考官覺得我們在湊回答字數，同時，也為下面我們要回答的內容定了拓展方向，方便我們進一步進行補充說明。
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