精选优质文档-倾情为你奉上人教版九年级英语Unit6When was it invented ?知识点1. invent v. 发明 inventor n. 发明家 invention n. 发明，可数名词The inventor has invented many inventions in the past few years.2. be used for doing=be used to do ，用来做（是被动语态）（这个短语的考点有两点，一是used for的意思，二是for后面用动名词）Pens are used for writing. 笔是用来写的。used to do 过去常常做某事be/get used to doing 习惯于做某事put into good use 好好利用use sth. to do 用某物做某事给某人某样东西 give sth. to sb. I gave a pen to him. 我给他一支笔。 give sb. sth. I gav
