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英語三級已經開始報名了，對于大學很久沒有學英語的人來說英語三級還是有一定難度的。下面是小編從大神那里拿來的2017年英語三級精選詞組知識點大綱，需要的快來下載吧！

2017年英語三級精選詞組知識點預覽

as though 似乎、好像

【例句】He behaved as though nothing had happened. 他裝作若無其事的樣子。

【總結】as if/as though的用法

as if 與as though 是一組同義詞，兩者意思相同，用法也相同，只是在口語中人們多半會用as if, 取其簡短。as if和as though用法較為復雜，

(一)在通常情況下，as if 和as though所引導的從句的謂語動詞多用虛擬語氣，表示所敘述的情況與事實相反。具體用法如下：

1)談論現(xiàn)在情形的，用過去時(動詞be用were,也可用was)：

Why is she looking at me as though she knew me? 他為什么那樣看我?像是認識我似的。

He behaves as if he owned the house. 他的樣子好像他擁有這個房子。

Its not as though he was /were poor.

2)談論過去情形的動詞形式有以下幾種：

a)過去式，表示過去的狀態(tài)，如：He stood there looking at the train and laughing, as if to miss a train was the best joke in the world.

他站在那里，望著火車哈哈大笑，好像誤了火車是天底下最開心的事兒似的。

Mr. Coleman always talked as if he knew everything.

但是，如果狀態(tài)動詞帶有持續(xù)時間狀語，則用過去完成時：

They talked as if they had been friends for years.

(試比較：They had been friends for years.)Now it is as though she had known Millie for years. (《現(xiàn)代英語用法詞典》)情態(tài)動詞亦用過去時：

b)過去完成時，表示過去的動作先于主句動詞而發(fā)生或完成，如：

It was as if he had lost his last friend.

I remember, she tells her children now,how wild his white hair looked——as if it had been electrified.必須注意的時，在指過去的動作時，即使主句是現(xiàn)在時，as if 從句中的動詞也要用過去完成時：He talks about Rome as though he had been there himself.

他講起羅馬的情況來就好像他親自到過那里似的。

c)過去進行時，表示動作正在進行：

He heard a noise, as if someone was breathing.

I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在腳下滑動。

d)過去將來時，表示將要發(fā)生的事態(tài)：It looked as if it was going to snow.