给某人买某物  buy somebody something,

 buy something for somebody,

给我妈妈买了件毛衣     buy my mother a sweater,

buy a sweater for my mother,

buy的东西若是代词，只能用buy something for somebody    

  给他买了这件东西。  buy it for him,

看看        have a look at,

 look at,

七美元        seven dollars ,

 白色的包              white bag,

 服装店 clothes store,

 以很低的价格 at very good prices,

 对于男孩子for boys,

 红色的裙子       skirts in red,

28美元twenty-eight dollars,

 大降价！   Big Sale!

 二十元twenty yuan,

 一双黑色的鞋子a pair of black shoes,

 你想要什么颜色的？What color do you want?

 从某人那买某物。buy something from somebody,

 把某物卖给某人。sell something to somebody,

 这顶帽子多少钱？  How much is the hat?

 五美元。It’s five dollars,

 这双短袜多少钱？ How much are these socks?

 两美元。They’re two dollars,

 我能帮您吗？ Can I help you?

 好的。Yes, please,

 给你。Here you are,

 我买了。I’ll take it,

谢谢。Thank you,

 不用谢。You’re welcome,

 帮助某人做某事。help somebody with something,

 我的老师帮我辅导家庭作业。My teacher helps me with my homework,

 汤姆经常帮他爸爸打扫花园。Tom often helps his father clean the garden,

 汤姆经常帮他爸爸打扫花园。Tom often helps his father to clean the garden,

 “救命”          help!

帮助某人做某事。help somebody with something

 丽萨经常帮我学习英语。Lisa often help me with my English,

自便，随便       help oneself

自便，随便吃喝         help oneself to,

 来，孩子们，随便喝些果汁。 Come on, boys, Help yourselves to some juice,

 “忍不住做   ”  can’t help doing something,

 凯特赢得了比赛后，忍不住哭了。Kate couldn’t help crying when she won the match,

help 作名词，意为“帮助”是不可数名词。

 托尼需要一些帮助。 Tony needs some help,

need做实义动词，有人称和数的变化，“需要”，后接名词、代词或动词不定式。

注意need doing something意为“需要被做”是主动形式表示被动的含义。

这件衬衣该洗了。This shirt needs to be washed,

This shirt needs washing,

 他们不需要我们帮助。They don’t need our help,

 吉姆的自行车坏了，他需要买辆新的。Jim’s bike is broken,He needs to buy a new one,

我很想呼吸一点新鲜空气。I'm in need of some fresh air,

need做情态动词时长用于否定句和疑问句中，“需要，必要”，后接动词原形，此时need无人称和数的变化，可以直接加not构成否定句，也可直接提到句首变为一般疑问句。

 你不必为此担心。You needn’t worry about that,

我们有必要周六前完成工作吗？  Need we finish the work before Saturday?

come,做不及物动词时，意为“来，来到”，后接动词不定式做状语，come to do something 来做某事。

come,的反义词是go，后接地点名词时，需加介词to,；后接地点副词时，则要省略介词to,

 他每天很早来上学。He comes to school early every day,

school,是地点名词   

请十点前来这儿。Please come here before ten,

here,是地点副词

buy,做及物动词，意为“买，购买”，后接名词或代词做宾语。

我想买点苹果。I want to buy some apples,

buy,后接双宾语

  “给某人买某物”buy somebody something

  buy something for somebody,

   我妈妈每年给我买新衣服。My mother buys me new clothes every year,

 My mother buys new clothes for me every year,

sell及物动词，出售；销售；卖

“卖某物给某人”sell somebody something,

 sell something to somebody,

他们打算把他们的书卖给我。They are going to sell me their books,

They are going to sell their books to me,