固定結(jié)構(gòu):疑問詞＋主語＋should/could/will do=疑問詞＋動(dòng)詞不定式（to do）
1.Mr Black has bought a sofa. He wonders where to put it.
句意：布萊克先生買了一張沙發(fā)。他不知道該把它放在哪里。
原句where（疑問詞） he should put=where to put 。
故改為：Mr Black has bought a sofa. He wonders where to put it.
2.Sandy is not good at history. She does not know how to improve it.
句意：桑迪不擅長(zhǎng)歷史。她不知道該如何改進(jìn)。
原句how（疑問詞） she could improve=how to improve。
故改為：Sandy is not good at history. She does not know how to improve it.
3.There are many toys in the shop. Peter is not sure which to buy for his cousin.
句意：商店里有許多玩具。彼得不確定該給他表弟買什么。
原句which（疑問詞） he should buy=which to buy。
故改為：There are many toys in the shop. Peter is not sure which to buy for his cousin.
4.Simon loves football. He has decided what to do in the future.
句意：西蒙喜歡足球。他已經(jīng)決定了將來要做什么。
原句what（疑問詞） he will do=what to do。
故改為：Simon loves football. He has decided what to do in the future.
5.Wilson has ordered a robot. He wants to know when to receive it.
句意：威爾遜訂購(gòu)了一個(gè)機(jī)器人。他想知道什么時(shí)候能收到。
原句when（疑問詞） he could reveive=when to receive。
故改為：Wilson has ordered a robot. He wants to know when to receive it.
6.Kitty is going to have a birthday party. She is thinking about who to invite.
句意：基蒂要舉辦一個(gè)生日聚會(huì)。她在考慮她應(yīng)該邀請(qǐng)誰。
原句who（疑問詞） she should invite=who to invite。
故改為：Kitty is going to have a birthday party. She is thinking about who to invite.
