She saw from their face that they already knew .这个句子后半句是不是可以改为they have already known.
热心网友
ifyou'dliketochangethesentenceitshouldbe"thehadalreadyknown"thereaonis "theyknow"happenedbeforetheactionof"isee"since"isaw"-----pasttense,so""theyhadalreadyknown"----pluperfect(that'swhenitisused)otherexamplestheyhadallgonewheniarrived.
热心网友
不可以，因为前半句中的saw是过去式.后半句谓语动词的正确形式应该是had known.
热心网友
应该把have改为had
热心网友
如果一定要改，那就应当使用had ,而不是have
热心网友
no,maybe it should be"they had known".
热心网友
yes,it is ok