一、look forward to
该短语表示“期望;期待”，注意to是个介词，所以后接动词时要采用动名词(即-ing)的形式。如：
We look forward to the return of spring. (我们期待着春天的到来。)
I look forward to paying you a visit next week. (我期待着下星期去拜访你。)
二、look out
该短语主要表示“留神;小心”，而且经常直接用作提示语，单独成句。如：
Look out! The pan of milk is bubbling over! (小心!那锅牛奶溢出来了!)
但是，look out也可以像下面的句子一样，用作句子的谓语：
Do look out for spelling mistakes when you check your work. (你检查作业时，一定要当心拼写错误。)
注意
当look out与of连用时，不再表示“留神;小心”，而是表示“往外看”。如：
Looking out of the window, I see a lot of children play and yell. (我从窗口往外张望时，看到许多小孩一面玩耍一面叫嚷。)
三、look up
该短语主要表示“查阅;仰视;看望”。如：
查阅：You can look up this word in the vocabulary. (你可以在词汇表里查这个词。)
仰视：He lay on his back and looked up at the sky. (他仰卧著观看天空。)
看望：I shall certainly look up all my old friends when I go back home. (我回家的时候，当然要去看望我所有的老朋友。)
注意
当look up与介词to连用时，表示的是“尊敬;敬仰”。如：
The children all look up to the baseball player. (这些孩子都很敬仰那名棒球运动员。)
四、更多相关短语
(一)look at
该短语表示“看着”，相当于have a look at。如：
Let me rest a while and look at the view. (让我歇一会儿，看看这景色。)
(二)look for
该短语表示“寻找”，相当于search for。如：
He thumbed through the directory to look for her number. (他翻阅电话号码簿找寻她的号码。)
(三)look after
该短语表示“照顾;看管”，相当于take care of。如：
They employed her to look after the baby. (他们聘请她照料婴儿。)
(四)look into
该短语表示“浏览;调查”。如：
浏览：They stopped to look into the window. (他们停下来看看橱窗。)
调查：A working party has been set up to look into the problem. (已成立工作组调查该问题。)
(五)look down
该短语表示“俯视;轻视”。注意，当look down表示“轻视”时，其用法为：look down on/upon，或者look down one's nose at。如：
俯视：The director look down at the actor from the dolly. (导演从摄影车上看下面的演员。)
轻视：Her parents told her not to look down upon countrymen. (她父母叫她不要瞧不起乡下人。)
轻视：He looked down his nose at the offer. (他对这个建议嗤之以鼻。)
(六)look over
该短语主要表示“检查”。如：
Look over the exercises before handing them in. (把练习再检查一遍。)
(七)look through
该短语主要表示“看穿;检查”。如：
看穿：He looked through a pane of glass. (他从一块玻璃看过去。)
检查：We'd better go and look through his luggage. (咱们还是去翻翻他的行李吧。)
(八)look on
该短语表示“看待;旁观”。如：
看待：I used to look on him as a friend. (我以前把他看作是一位朋友。)
旁观：In no case will they look on passively. (他们决不会在一边看热闹。)
(九)look to
该短语常用在“look to it that...”结构中，表示“留心;注意”。如：
Look to it that you make no more similar mistakes. (注意今后你不要再犯类似的错误了。)
(十)look like
该短语表示“看起来像”。如：
He called me a copy cat just because my new shoes look like his. (只因我的新鞋子象他的，他就说我的模仿他。)
(十一)look around
该短语表示“环视;东张西望”。如：
I just want to look around and see if I can get any gifts to take home. (我只是想随便看看，看能不能买到什么礼品带回国去。)
(十二)look back
该短语表示“回顾;回头看”。注意当look back表示“回顾”时，常后接介词on或to。如：
回头看：On and on he ran, never daring to look back. (他直往前跑，怎么也不敢回头看。)
回顾：I like to look back on my high-school days, which were the happiest in my life. (我喜欢回顾我的中学时代，那是我生命中最快乐的时光。)