1 There were four oranges on the table.
2 I didn't see one boy on the street.
3 went
4 had a good time
5 Did , put
Yes, did
6 Where did , work
/t / milk , stop , pick ,talk , watch
/d / play , climb , study, worry , plan , clean , learn
/id/ visit
方法：清对清,浊对浊,元音对浊辅音,/t/ /d/ 后读/id /