i really dont know what i could have done yesterday evening without your help为什么要用could have done ?should have done 行不行?

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• 英语翻译Ego-You In pain you seek All that you need When d’you decide That when all is said and done You’d laugh it off and run In time you’ll see What you kept from me I should have known We could have made it through But that’s just ego-you Time will show And time will tell What you need to make it well Time will show - I know If I let you go Throughout your life All filled with strife All you desire Has been torn up in two Because of ego-you Time will s
• i really dont know what i could have done yesterday evening without your help为什么要用could have done ?should have done 行不行?
• i really dont know what i could have done yesterday evening without your help
• 3.I could have called you yesterday,but I ________ your telephone number.A.didn't have B.won't have C.hadn't had D.wouldn't have 4.—Oh,tomorrow is the weekend again.—Yes,time goes fast.Have a nice weekend.—________ A.OK.Let's have a good time.B.Yes,I think so.C.Thanks.The same to you.D.But I think time goes slowly.45.I wasn't first ________,for I saw smoke ________ from the window.A.to arrive; to rise B.arriving; rising C.to arrive; rising D.having ar
• can是情态动词,表示能,可以 .后接动词的什么