Unit3Teenagersshouldbeallowedtochoosetheirownclothes
规则动词的过去分词:1)一般情况在动词原形后加-edwatch---watched2)以不发音e结尾的加-dpractice---practiced3)以辅音加y结尾的,去y变i加-edstudy---studied4)以重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加-edstop---stopped2
不规则动词的过去分词:amisarebeenhavehashaddodonewritewrittengogone改被动语态1
Theyshouldallowustohavepart-timejobs
Weshouldallowchildrentospendtimewiththeirfriends
TheteachershouldallowAnnatofinishthepicture
Weshouldbeallowedtohavepart-timejobs
Childrenshouldbeallowedtospendtimewiththeirfriends
Annashouldbeallowedtofinishthepicture
Wecanfinishtheworkinaweek
Studentsmaytakethesebooksoutofthelibrary
Theymustreturnthetool(工具)ontime
Theworkcanbefinishedinaweek
Thesebooksmaybetakenoutofthelibrary
Thetoolmustbereturnedontime
Parentsshouldallowchildrentochoosetheirownfriends
Childrenshoul