英文mustn't,don't have to,doesn't have to,didn't have to有什么区别

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• 1道高中英语单选Although we have been working in the same office for several years,she ______me much impression.A.didn'tleave B.doesn't leave为什么?这考察的是哪部分内容?有没有类似的题告诉我几道?我现在要突破单选!
• 用否定前缀的形容词造句1.This is a “No Parking”area.________________________________2.This chair is too small.3.___________________________________4.The boy didn’t tell the truth.__________________________________5.The restaurant is quite near here.___________________________________6.I don’t like him because he is rude._____________________________7.I have never seen such heavy snow here.___________________________________8.Water is very important to us.________
• The bicycle riders___weasr helmets.a.haven't to b.mustn't c.don't to have to d.don't have to
• sir my car doesn't work .don't worry ,i'll look into the matter.just have a little_____
• 21.I thought Jim would say something about his school report,but he _______ it.A.doesn’t mention B.hadn’t mentionedC.didn’t mention D.hasn’t mentioned22.—You’re drinking too much.—Only at home.No one _______ me but you.A.is seeing B.had seen C.sees D.saw23.I’ve won a holiday for two weeks to Florida.I _______ my mum.A.am taking B.have taken C.take D.will have taken24.The little girl _______ her heart out because she _______ her toy bear and believed s
• these boxes can be used ___ seats if we don't have enough seats for the party.beused for 和be used as有什么区别.这里能否填for
• 几道英语习题不会做— I’m sorry for giving so much trouble. — _______. A. It doesn’t matter B. All right C. It’s my pleasure D. Don’t say so, please — I’m afraid I’ve got to go now. — ______. A. It’s still early B. You didn’t have to do it C. You look great today D. I forgive you— His wife passed away last week. — _______. A. She’s been ill for a few months B. She was a kind woman C. Sorry to hear that D. Let’s go and help him — How is your family? — _______.
• his arm is all right.he go and see the doctor.A.has not to B.don't have to C.haven't to D.doesn't have to 选哪个?
• It's always difficult being in a foreign country,especially if you don't know the culture of thecountry.请问being 什么成分,什么用法,我真不理解我在网上查了很多，没有it's difficult doing sth，只有 have difficult in doing sth,请问到底该怎么正确理解,有it's no use doing,no good doing等等
• I find it beautiful,' I said.'A man can never have too many ties.'此句中it所指以下为新概念二41课课文'Do you call that a hat ' I said to my wife.'You needn't be so rude about it,' my wife answered as she looked at herself in the mirror.I sat down on one of those modern chairs with holes in it and waited.We had been in the hat shop for half an hour and my wife was still in front of the mirror.' We mustn't buy things we don't need,' I remarked suddenly.I regretted sayi
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• -Must I wash dishes after supper?-No,you ( ).A mustn't.B don't have to.C don't.D must.