1．"状态持续"类系动词

　　这类系动词表示主语某种状态的持续。常见的有：remain(依然)，keep(保持)，stay(保持)，lie(处于......状态)等。

　　I don't think we can stay friends.

　　我认为我们不能做朋友了。

　　She remained silent all night, and we were all worried about her.

　　她整个晚上都沉默不语，我们都为她担心。

　　Snow was lying thick on the ground.

　　厚厚的积雪覆盖着大地。

　　[即时演练1]　完成句子

　　①我希望我的家人身体能够永远健康。

　　I hope my_family_can_keep_fit forever.

　　②此事仍是一个谜。

　　This matter remains_a_mystery.

　　③这名飞行员告诉所有乘客保持坐立姿势，飞机正在着陆。

　　The pilot asked all the passengers on board to_remain_seated as the plane was making a landing.

　　④四月份，成千上万的度假者由于火山灰的影响而被滞留在国外。

　　(福建高考改编)In April, thousands of holidaymakers remained_stuck_abroad due to the volcanic ash cloud.

　　2．"主观判断"类系动词

　　这类系动词包括seem(似乎是), appear(似乎，显得), prove(证明是), turn out(结果是，证明是)。

　　In the eyes of our grandparents, his painting seemed absurd.

　　在我们的祖父母看来，他的画似乎是荒唐可笑的。

　　He may appear a fool, but actually he's quite clever.

　　他看起来也许很傻，但实际上他很聪明。

　　The opposition proved too strong for him.

　　对手过于强劲，使他难以招架。

　　[名师点津]　(1)seem 和appear后可以接to do, to be doing以及to have done的形式，也可用于句型：It seems/appears that ＋主语＋其他。

　　He seems to have carried out plenty of experiments.

　　＝ It seems that he has carried out plenty of experiments.

　　他好像做了很多实验。

(2)seem后还可以接as if/as though引导的表语从句。根据语境的不同，从句可用陈述