牛津譯林版八年級英語上冊《Birdwatching》PPT課件(第4課時)，共14頁。
We need to protect birds.
動詞不定式的用法
一、動詞不定式表示目的，作目的狀語。
1. I stayed there to see what would happen. to后面所接的 see 是前面這個動作stayed there的目的。意為“我呆在那兒，(目的是)看看會發(fā)生什么。”
2. 有時為了強調， 可用in order to 或so as to。
eg：Bob took down my telephone number so as(in order)not to forget it.
3. 由 in order to 引導的目的狀語，既可以置于句尾，也可以置于句首，而由 so as to 引導的目的狀語，只能置于句尾，而不能置于句首。比較：
They started early in order to get there in time. (正)
In order to get there in time, they started early. (正)
They started early so as to get there in time. (正)
So as to get there in time, they started early. (誤)
二、動詞＋賓語＋ 動詞不定式結構，此時動詞不定式可以說明賓語的情況，在句中作賓語補足語。
1. 可跟不定式作賓補的動詞：warn, tell, allow, ask, order, get, invite, wish, want, encourage等
eg：The teacher told me to clean the blackboard.
I want you to give me some help.
2. 有些感官動詞(如see、hear、watch、notice等)和使役動詞(如let、make等)后要跟不帶to的動詞不定式(短語)作賓語補足語�？偨Y起來有“五看，三使，二聽，一感覺”。
eg：I saw him play basketball with Jack an hour ago.
Let me tell you something about him.
課堂練習
用所給詞的適當形式填空
1．Jessica's parents always encourage her ________ (speak) English.
2．We are now inviting more people ________ (join) us in protecting birds.
3．In the end, my father let me ________ (watch) the video about tigers.
4．The report on rare birds made us ________ (feel) sorry.
5．My mother advised me ________________ (not wear) leather shoes to the wetlands.
6．I heard the girl ________ (sing) an English song when I passed her room.
7．Hunters kill wild animals ________ (make) money.
8．We decided to put up some posters ________ (tell) people the importance of saving birds.
9．When I looked up, I saw a mother bird ________ (feed) her babies.
10．________ (save) these rare birds, people are going to build more reserves for them.
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關鍵詞：《Birdwatching》PPT課件免費下載，.PPT格式
