短语动词

Phrasal verb

The term phrasal verb is commonly applied to two or three distinct but related constructions in English: a verb and a particle and/or a preposition co-occur forming a single semantic unit. This semantic unit cannot be understood based upon the meanings of the individual parts in isolation, but rather it can be taken as a whole. In other words, the meaning is non-compositional and thus unpredictable.[1] Phrasal verbs that include a preposition are known as prepositional verbs and phrasal verbs that include a particle are also known as particle verbs. Additional alternative terms for phrasal verb are compound verb, verb-adverb combination, verb-particle construction, two-part word/verb, and three-part word/verb (depending on the number of particles), and multi-word verb

上面是维基百科对短语动词的解释，下面我们一起来举例学习一些短语动词。

短语动词（phrasal verb)指动词+介词，动词+副词，动词+副词+介词，动词+名词+介词构成的新的动词，其意义构成不是组成词组的意义的简单相加，而是产生了新的意义。短语动词是约定俗成的，往往是固定搭配，不可拆分，被视为一个整体。词典通常会标注其为phrasal verb, 或者以单独词条列出。

1. Verb + Preposition；

drop in

 If you drop in on someone, you visit them informally, usually without having arranged it. 顺道拜访;突然拜访

Whenever I'm up there I always drop in... 

每次我到那儿都会顺便去看看。

Why not drop in for a chat?... 

为什么不过来聊聊天呢？

She spent most of the day dropping in on friends in Edinburgh. 

她一天的大部分时间都用来拜访在爱丁堡的朋友了。

I hate to drop in on people when they aren't expecting me.

You're welcome to drop in at any time.

We wont stay a minute. We just dropped in to say hello.

以上例句都是摘自字典，根据例句相信读者已经学会了drop in这个短语动词的意思了。