一.不定式

　　1.定義：具有名詞、形容詞及副詞性質(zhì)并具有時(shí)態(tài)、語(yǔ)態(tài)變化。

　　2.形式：(以do為例)

　　主動(dòng)語(yǔ)態(tài) 被動(dòng)語(yǔ)態(tài)

　　一般時(shí) to do to be done

　　進(jìn)行時(shí) to be doing

　　完成時(shí) to have done to have been done

　　完成進(jìn)行時(shí) to have been doing

　　3.用法：

　　(1)用作主語(yǔ)：

　　To speak good English is not easy.

　　or: It is not easy to speak good English.

　　(采用形式主語(yǔ) it 以避免頭重腳輕)

　　It took me an hour to do the work.

　　(2)用作賓語(yǔ)：

　　She decided to take the examination.

　　I hope to meet him soon.

　　(3)賓語(yǔ)補(bǔ)足語(yǔ)：

　　They expected us to help them.

　　Hewants his son to study hard.

　　重點(diǎn)：

　　不定式作賓補(bǔ)，如謂語(yǔ)動(dòng)詞是感官動(dòng)詞，使役性動(dòng)詞(see, hear, notice, watch, make, have, let...)，則不定式符號(hào)“to”須省略，但在被動(dòng)語(yǔ)態(tài)中不能省。

　　I heard them sing in the classroom.

　　I made her clean the room.

　　The girl is heard to sing an English song.