why couldn't they catch the 6:30train?Because they were delayed by()some heavy traffics,any heavy traffic,a heavy traffic,heavy traffic选哪个?

why not,why didn't,why couldn't的区别 I couldn't underst and why they were all laughing at me.为什么laugh要加ing why couldn't linda see davy为什么不说成“Why linda couldn't see davy They couldn't agree with each other they couldn't have done better是什么意思 高三英语语法题Why couldn't they catch the early train?They were delayed by______答案是heavy traffic为什么不是a heavy traffic Why couldn't they meet us at five o'clock? Because they were delayed by heavy traffic帮忙 翻译一下 求解释 why couldn't they catch the 6:30train?Because they were delayed by()some heavy traffics,any heavy traffic,a heavy traffic,heavy traffic选哪个? They all looked so damn happy to me.They all looked so damn happy to me.why couldn't l look like that? ---Why didn't you stop them from going into the forest?---I did try.But they _____listen to me.A.couldn't B.wouldn't C.needn't D.shouldn't但why? They couldn't help ______when they heard the news. 改错They couldn't find such books that they needed. they couldn‘t see anything unusual改成同义句 why couldn't they meet us at five o'clock? Because they were delayed by ___A.a heavy traffic B.heavy traffic C.some heavy traffic D.traffic being heavy答案是B 不知道为什么 “Why didin't they want foreign engineer? 疑问句中情态动词的位置?Why couldn't you get to sleep?能用Why you couldn't get to sleep? why not可以=why don't you可不可以=why don't we/they. 翻译:they looked for the treasure for many days,but they still couldn't find any