引导从句的词1、引导从句的词引导从句的词常有:when/ while/ whenever/ before/ after/ until/ till 和 if/ unless/ though,但简化必须符合下面两个条件
(1)当从句与主句主语一致,且从句谓语有 be 的某种形式时,常可以把从句的主语及 be 省略掉
①Be careful when(you are) crossing the street
过马路的时候要小心
②He knows many things though(he is)very young
他年龄不大,但知道的事不少
③I won’t go to her party unless(I am) invited
要是不受到邀请,我就不去参加她的宴会
④While (he was)walking along the sands
Crusoe saw some footprints in the sand
克鲁索沿沙滩走着的时候,看到沙子上有些脚印
(2)当从句为 it is + adj
时,也常将 it is 省略掉
①When (it is)possible,I’ll go to Beijing to see you
可能的时候,我将去北京看你
②If (it is)necessary, I’ll come tomorrow
必要的话,明天我就来
2、只能接动名词作宾语的词1)动词:admit, advise, consider, delay, enjoy, excuse, escape, finish, forbid, imagine, keep, mind, miss, practise, suggest, understand2)词组:insist on, think of, give up, dream of, hear of, depe