介词在英语学习中占据非常重要的席位。按照单词的个数，介词可分为单词介词（如on，in和at）、双词介词（如owing to）、三词介词（如in front of）和四词介词（如in the front of）。下面是英语学习必备的四词介词。

as a result of 作为结果的，因而发生的

at the cost of 以……为代价

at the expense of 由……付费，由…负担费用；以……为代价

at the mercy of 任凭……的摆布，完全受……支配

at the risk of 冒着……的危险

for the sake of 为了……起见，看在……的份上

in the event of 假如

in the face of 在……面前； 尽管，不顾

in the habit of 有……的习惯

in the name of 以……的名义

on the brink of 濒临，处于……边缘

on the point of 正要……之际，就要……之时

with the exception of 除……以外

请看例句：

1. In the event of rain, the match will be postponed. 如果下雨，比赛将延期。

2. The company is on the brink of bankruptcy. 该公司已濒临于*的边缘。

3. There had been times when she had felt sickened by the things people did in the name of business. 有时人们打着做生意的幌子所做的事情让她感到恶心。

4. They showed great perseverance in the face of difficulty. 他们面对困难表现了坚强的毅力。

5.We must cherish experience acquired at the cost of blood. 我们必须珍惜用鲜血换来的经验。

6. They are worth having but not at the expense of better services. 它们值得拥有，但是不能因此放弃更好的服务。

7 He was on the point of saying something when the phone rang. 他正要说话时电话铃响了。

8. Her heart was slightly damaged as a result of her long illness. 久病使她的心脏受到一些损伤。

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