they began to work instead to make life better 怎么翻译?

After ＿(test) the machine,they began to work. they (know)each other since they (begin) to work in that factry.请问正确时态是什么呢?1.knew.began.2.have known.began.3.had konwn.began. they began to work instead to make life better 怎么翻译? I began to wonder not until i began to work[]how much time i had They began to work instead to make life better .这个句子如何理解,instead 后加to do .还是doing only after six months,i began to see the result of my work 对一个英语句子感到奇怪When I began work on the case on Tuesday,we looked for the stranger.(这个句子中“ begin work on.”为什么不用“began working on.”或 “began to work on .”请帮做出解释 We eat and drink _____(live)They began to work ___ the project last year.(介词填空) Not until i began to work did i realize how much time i had wasted.部分倒装.怎么倒装? I didn't realize how much time I had wasted until I began to work的倒装句 I began to crazy miss 英语翻译：I left meeting when they began to talk about politics and headed for the exit. I began to study English to make my work better.I _ _ English _ to _ my work.同义句改写 why didn't I think before I began to work?这是什么句子?why didn't什么语法?可以改写成why I didn't think before I began to work? After I finished the school this year,I began to look for work.（什么地方错了） the years of study and work began to pay off ,and i knew i was doing well 翻译 the meeting began when they finished their work同义the meeting has()()()they finished their work