为什么用buy而不是boughtDid shi buy them here?No she bought them in the US

为什么用buy而不是boughtDid shi buy them here?No she bought them in the US 为什么英语中定语从句用which to buy,而不是to buy which是which one to buy和to buy which one 句型：We must save the trees and not buy things made of ivory.为什么buy前用了not,而不是don‘t ,made用过去式? 为什么i spent 5 yuan _this book.填buy,而不是to buy 或 bought? If you had enough money ,what_____?为什么填would buy,而不是will you buy? who bought a new bike yesterday?疑问句中动词不是用原型嘛?为什么这里用bought而不是buy? 英语翻译为什么是where did you buy this?而不是where you buy this?为什么要加DID还有你昨天干吗?为什么有是what were you doing 为什么又要用WERE搞不懂啊 Who bought the sweater?谁买了这件毛衣呢?在这里为什么用的是who bought而不是who did buy呢? 一句英语改错题I was at the Shanghai Railway Station buy ticket to Hangzhou.为什么要把buy改为buying而不是station后边加to? The fox____the chicken were killed was shot.为什么填by which?I am going to the fruit shop.____you are there,would you please buy me some apples?为什么用 if 而不是 which. buy up 和 buying up 的区别有这样一个句字,我想问下为什么要用buying up而不是buy up?Made her fortune buying up beach front land along the Black Sea coast once the Soviet Union crumbled.我问的是为什么要用现在分词? I decide which one to buy.为什么要用which one to buy?而不用which to buy?谢谢.I decide which one to buy. 为什么要用which one to buy? 而不用which to buy?谢谢. 电线为什么用【铜】而不是用【金】? i need some money to buy gifts for my family.【为什么是用to buy;为什么用for而不是to?】2.Tom says he ____ a doctor in ten years.【此题用is going to 还是 will be?】3.she has so little schooling that she can't teach such little chil 化肥为什么用碳酸氢铵而不是碳酸铵 坦克为什么用履带行走,而不是轮子? 为什么检验HCl用AgNO3 而不是Ag2SO4 回声探测仪为什么用超声波而不是次声波