buy 过去式和过去完成时都是bought buy的现在进行时buying buy的单三buys
一般现在时他常常买东西:
He often buys something他们常常买东西，They often buy something在一般现在里面动词一般要用三单式或原形。
一般过去时动词要用过去式，比如:他买了东西，He bought something yesterday。
在现在进行时里面一般要用Be加上doing的结构，比如他正在买东西，He is buying something.
buy的常用句型
1、buy sth at+商店（在某商店买某物）
He bought a table at that store.
他在那个商店买了一张桌子。
2、buy sb. sth（给某人买某物）
My husband bought me a new coat.
我丈夫给我买了一件新外套。
3、buy sth for sb.（为某人买某物）但不能这样搭配：buy sth to sb.
Her mother bought a new book for her.
她妈妈给她买了一本新书。
4、buy sth for/at+钱（花多少钱买）
How much would you spend to buy a new car?
你会用多少钱买一辆车？
5、buy sth from/off/of（从某处买某物）
He bought the house from his friend.
他从朋友那买下了这套房子。
其它例句:
How much do they buy?
他们买多少？
I will buy this bag for you.
我给你买这个包。
She was trying to buy him off, so I wouldn't go with you tonight.
她想要收买他，所以我今晚不能和你一起去舞会了。
How much would you spend to buy a box of mooncake?
你会用多少钱买一盒月饼？
