should和would的用法：

　　should常译作“应该”,would常译作“愿意；会”.

　　1.should和would都可用于疑问句,表示征询意见或提建议.但它们比shall和will更委婉.如Shouldweopenthewindow?/Wouldyoumindaskingyousomanyquestions?

　　2.should和would都可用于肯定句或否定句.

　　(1)should译作“应该”,表示义务或推测.如Weshouldprotectourenvironment.(义务)/Youshouldn’tknowhim.(推测)

　　(2)would译作“愿意；会”,表示过去的意愿或意志.如Shesaidshewouldbecomeavolunteer./Hepromisedthathewouldn’tfallbehindothers.

　　3.should和would都可作助动词,它们是shall和will的过去式,用于过去将来时,译作“将要”.should用于主语是第一人称,would用于主语是任意人称.如Hesaidweshould/wouldmovetothesecondfloor.