Examples 1.be Archimedes was a famous scientist,wasn't he? 2.Auxiliary verbs助动词：do,have He didn't make the crown with gold,did he?(the statement uses an action verb行为动词make,so the tag should use did) Jimmy has the key to the classroom,doesn't he?(the statement uses has,and has can been seen as an action verb here,so the tag should use doesn't) The train has left,hasn't it?(has here is used as an auxiliary verb.助s动词，so the tag should use hasn't)Examples 1. be Archimedes was a famous scientist, wasn’t he? 2. Auxiliary verbs 助动词: do, have • He didn’t make the crown with gold, did he? (the statement uses an action verb行为动词 make, so the tag should use did) • Jimmy has the key to the classroom, doesn’t he? (the statement uses has, and has can been seen as an action verb here, so the tag should use doesn’t) • The train has left, hasn’t it? (has here is used as an auxiliary verb助动词, so the tag should use hasn’t)