从句部分是用以补充说明主句中谓语动词发生的目的的状语从句。表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导;目的状语从句的谓语常含有may, might, can, could, should, will, would等情态动词。
可以从一下几个方面了解学习:定义-----从句部分是用以补充说明主句中谓语动词发生的目的引导词------从句可以由that, so that, in order that, lest, for fear that, in case等词引导; 其中,常用的连词有: that(以便),so that(以便), in order that(为了;以便),Lest(免得;唯恐), for fear that(生怕;以免) eg: Say it louder(so)that everyone can hear you.大声说,以便大家都能听到你。 I am telling you that lest you should make a mistake. 我告诉你这一点,以免你搞错。 从句谓语-----含有may, might, can, could, should, would等情态动词(情态动词有四类: ①只做情态动词:must,can(could),may(might),ought to ②可做情态动词又可做实义动词:need,dare ③可做情态动词又可做助动词:shall(should),will(would) ④具有情态动词特征:have(had) to,used to)eg: You must speak louder so that /in order that you can be heard by all. [注意] 1. 在口语中so可以引导目的状语从句。 eg: We'll sit nearer the front so we can hear better. 我们坐的靠前一点,因此,我们听得清楚一点。 2. in order that与in order to的区别:in order that+从句 in order to+动词原形 ( in order to后面加的那个不叫目的状语从句,叫目的状语) 3. 目的状语从句的一个特点:由于目的都是未来的行为,所以从句中一般用表示未来可能性时态,比如上面两句中的could. 当然还可以用will,would,can,等 4. so that 和so as to 区别:so that 加从句 so as to do sth 跟in order to do sth 意思相近但不能放居首两个短语都可以表示目的,解释为“为了”但是so that还可以表示结果,解释为“以至于,以便” ,也就是说由so that引导的状语从句可以认为是目的状语从句,也可以理解为结果状语从句。