所謂溫故而知新，前五點(diǎn)大家要記得回頭認(rèn)真瞄一眼。

6、不定式作表語與?to?的省略

當(dāng)不定式用作表語的時(shí)候，其中的to 原則上是不能省略的。如：

His aim is to make a million dollars in ten years. 他的目標(biāo)是十年掙一百萬。

This wall made of stone was to keep the cattle out。這堵墻為的是不讓牲畜進(jìn)來。

但有一種例外，那就是當(dāng)主語部分有動(dòng)詞do的某種形式時(shí)，用作表語的不定式可以省略to。如：

All I did was (to) touch the vase, and it broke all of a sudden. 我只不過碰了一下窗戶，它突然就碎了。

7、并列不定式與to的省略

當(dāng)兩個(gè)或多個(gè)作用相同的不定式并列時(shí)，通常只需在第一個(gè)不定式前用to，其余不定式前的to 可以省略。如：

I’d like to go to sleep and（to）have a good rest。我想躺下休息了。

Will you go to the America or （to）the Africa? 你要去美洲還是非洲啊？

但是，如果兩者有對(duì)比關(guān)系，則后面不定式前的to不可省略。如：

To try and fail is better than not to try at all. 嘗試而失敗總比不嘗試好。

8、固定搭配與to的省略

1. let類固定搭配：let fall (無意中說出)，let fly(發(fā)射、攻擊)，let go (放開)，let slip (放走)，live and let live (自己活也讓別人活)等。如：

She let slip an opportunity to study abroad. 她錯(cuò)過了出國留學(xué)的機(jī)會(huì)。

He arranged all and then let fly. 他安排好了之后便開了槍。

I got to know what was going around from a few words she let fall. 我從她說的幾句話中猜出發(fā)生什么事了。

2. make類搭配：make believe (假裝)，make do (湊合著用)等。如：

The girls made believe (that) they were angles.女孩子們假扮成天使。

We were in a hurry so we had to make do with a quick snack. 我們時(shí)間很緊，只好胡亂吃了頓小吃。