问题标题：
几道关于情态动词的英语题目：1.WouldyoubesokindastokeepaneyeonmyhousewhileIamaway?(so+adj.+astodosth怎么理解,这里的Would能不能改为Can或Could,原因）2.Shouldthepainreturn,takeoneofthesepills.怎
问题描述：
几道关于情态动词的英语题目：
1.WouldyoubesokindastokeepaneyeonmyhousewhileIamaway?
(so+adj.+astodosth怎么理解,这里的Would能不能改为Can或Could,原因）
2.Shouldthepainreturn,takeoneofthesepills.怎么理解这个should
3.HeorderedthatTomshouldleavethhouseatonce.这里的should可以换成must吗?原因.
4.Thereisaknockatthedoor.Whocanitbe?这里的can能改成may?原因.
5.-Canyougoswimmingwihtusthisafternoon?
-Sorry,Ican't.I____takecareofmylittlesisterathomebecausemymotherisill.
A.canB.mayC.wouldD.haveto
6.-Mr.Smithmusthavebeentoyourhomethismorning.
-No,he______,becausehedidn'tknowmyaddress.
A.couldn'tB.can'tC.mustn'tD.maynot
包闻亮回答：
1.so+adj.+astodosth做结果状语would表示委婉的请求,could也有这种用法.
2.should表示一种条件,可译为：万一
3.动词order后宾语从句用虚拟语气,从句谓语用should+动词原形或直接用动词原形.
4.canbe常用于否定句或疑问句中表示不太肯定的猜测；maybe一般用于肯定句中表示不太肯定的猜测.
5.Dhaveto表示客观上的必须.
6.A上句时间为thismorning,视为过去时间,could这里作为can的过去式对待.
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