They began to climbed the mountain after they had bought all the food and drink.改为否定句

After ＿(test) the machine,they began to work. They stopped_____(play)football because it began to rain It began to rain.They stopped ___(go)home they wre on ____ way to school when it began to rain.( they )应是they were on ____ way to school when it began to rain (they) it is a exciting exercise to climbe .这个句子的语法有错误吗?用to 还是for ,还是1 ,it is a exciting exercise to climbe .这个句子的语法有错误吗?用to 还是for ,还是 “to climbe”不能摆在后面,2,另外如果说 climbe 初一英语短文填词Last weekend ,Xiao Ming and his classmates went to the m( ).When they a( ) at the mountains,they s( ) rubbish here and there.The ground l( ) very dirty.They had a short meeting and d( ) to pick up the rubbish while they climbe 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. it began to rain,句中it如何理解?麻烦好心人回答.while they are talking it began to rain. They had a short meeting and began to ( )it when they climbed up the mountains. they began to climb the mountain after they had bought all the food and drin just as they began to eat,they heard a great noise的意思要准确 while they were talking it began to rain and Dimitri stayed in Aleko's house until the rain这句话中while they were talking it began to they began to work instead to make life better 怎么翻译? 单句改错：DO you know when they began to fall in love to each other? They had hardly arrived when it began to snow.和They were about to leave when it began to snow.这两They had hardly arrived when it began to snow.和They were about to arrive when it began to snow.这两个句子意思好像是一样的吧,一个 Many children began to play chess when they were very young 英语翻译：I left meeting when they began to talk about politics and headed for the exit. They began to play in the park three hours ago.(改为同义句)