两种可能：1 He said that he would come if his work WAS over before 5:00 pm.(一般过去时) 2 He said that he would come if he HAD FINISHED his work before 5:00 pm.(过去完成时) 3 He said that he would hav...the teachear said he would fail me if i don't work harder.中为什么主语是过去将来时，而从句用一般现在时。有主语是过去将来完成时，从句是过去完成时的情况吗？你好。不管这一句是从哪里来的，The teachear said he would fail me if i don't work harder.是错句。应该是：The teachear said he would fail me if i didn'twork harder.--------注意，时态必须保持一致。真的错了，必须保持一致吗？这是《新概念英语2》的句子有主语是过去将来完成时，从句是过去完成时的情况吗？1是《新概念英语2》课文，还是中国人编写的练习？2 有主语是过去将来完成时，从句是过去完成时的情况-------- she said that she would take me out to dinner IF i had finished all my homework before 6:30 pm.== she said that she would take me out to dinner IF i finished all my homework before 6:30 pm.(你自己回顾一下你所学过的英语时态知识吧)