英语翻译Mary couldn't have received my letter,or she should have replied to me last week(否则她上周就该回信了)我想问可以不可以用or she would have用would代替有语法错误么还是说该回信的该就必须用should?

try as she might ,Mary couldn't get the box 英语翻译ha-ha 英语翻译ha Mary couldn't run very fast because she had a sore back.同义句 Yesterday Mary couldn't finish her homework,so she has to go on 什么 it this Mary COULDN'T make herself ____attention toBECAUSE HER CLASSMATES MADE SO MUCH NOISE.答案为paid , Mary ( )( ) her key to the bicycle yesterday.为什么是couldn't find,而不是found? 英语翻译玛丽的故事很滑稽,我们都忍不住笑了起来.(keep sb.from)Mary's story is very funny,she couldn't keep us from laughing.这样对么? Mary said they couldn't come on time,( 为什么空格里填的是didn't she 英语翻译Tom was （）he couldn't say a word 英语翻译I couldn't make myself understood in English. 英语翻译 Excuse me,i couldn't help overhearing your conversation Hey don’t be sorry,ha ha 英语翻译It's been hard wakin' up,wakin' up to the truthI've been so blind,couldn't see for love no.Tried my best to ignore it,wish the pain awayBut just like tomorrow,its coming round again.So darling,please don't treat me like a fool.Its been ha 英语翻译How did you spend your time to home?I taught myself on the Internet.I had a good time,but I missed my father very much.How about you ,Michaerl?Not so good.My mother didn’t let me out,so I couldn’t go roller skating.I had to wash my ha Mary _________ with embarrassment when she couldn’t answer the question.A.shiveredB.worriedC.flushedD.scattered为什么？ Yesterday Mary couldn't finish her homework,so she has to go on ___ it this afternoon.(do) Mary couldn’t her ID card,she looked worried.A.look for B.find C.find out