at构成的词组比较多，要细心区分。

1.动词+ at

arrive at抵达,call at访问某地, catch at(it)当场抓住, come at攻击, fire at向…开火,glance at瞟一眼, glare at怒目而视, grieve at忧伤，knock at敲,laugh at嘲笑, look at看一眼, pull at拉扯, rejoice at对…高兴，smile at向某人微笑, shoot at朝…射击, stare at怒目而视,thrust at刺向, tear at撕, tremble at颤抖，wonder at吃惊，work at工作。

2. be +形容词/过去分词+ at

be angry at恼怒于, be alarmed at对…保持警觉,be astonished at对…吃惊, be bad at不擅长, be clever at对某事很灵巧,be delighted at高兴，be disgusted at厌恶, be disappointed at对…失望，be good at擅长, be impatient at对…不够耐心, be mad at狂热于,be pleased at对…感到高兴, be present at出席, be satisfied at满意,be surprised at吃惊, be shocked at对…非常震惊，be terrified at受到…的恐吓,be quick at对…很机敏。

3.at+名词构成的词组

at a distance在一定距离，at a loss不知所措， at a time一次，at all一点也不，at any cost不惜一切代价，at best最好也只是，at first起初，at hand手头，at heart在内心里，at home在家;无拘束，at last最后，at least至少，at most最多，at once马上，at present目前。