Yes,主语+have/has. No,主语+haven’t/ has.
have been to / have gone to
be ----was/ were ----been (过去分词)
have been to 曾去过现已回来 have gone to 到某地去了,尚未回来 have been in/ at 在某地待了多久
例句:This kind of car sells well.
look,smell,feel,taste等系动词主动形式表被动
例句:The cloth feels soft.
现在完成时
定义:过去发生的动作对现在造成影响或结果 过去发生的动作一直持续到现在
结构:have/ has done(过去分词) 否定形式:haven't / hasn't done 一般疑问句:Have/ has +主语+ done....?
被动语态: We are made to work 12 hours every day.
(3)Must sth be done?回答用needn’t
例句:---Must his exercise book be handed in right now? --- Yes,it must. / No,it needn’t.
at 5 o’clock
was/were going would do to do
had done
by the time, before 主句用“过完”,从句一般过去时
1.引导词:if(如果);unless(除非;如果不);
as long as(只要)
2.主句:①一般将来时②含may,might,must等