1、同步语法讲解表语从句表语从句放在连系动词的后面，充当复合句的表语，一般的结构是：主语 +连系动词 + 表语从句。可以连接表语从句的连系动词有：be, seem, look, appear, sound, taste, feel, remain等。引导表语从句的词主要有：1. 连词that, whether, as if, as though。它们在从句中不担任句子成分，只起连接作用。that无词义， whether意为“是否”，as if / as though意为“仿佛，好像”。例如：The question is whether it is worth doing 问题在于这件事是否值得做
2、。It looks as if it is going to snow天看上去像要下雪。2. 连接代词who, what, which。它们在从句中充当主语、宾语、定语等。例如：The problem is wholl be in charge of the class问题是谁将负责这个班。He is not what he used to be他不是原来的样子了。3. 连接副词when, where, how, why, because。它们在从句中充当时间状语、地点状语、方式状语、原因状语。例如：That is because it rains often these days 那是由于这些天经常下雨。The question is how we can learn English well问题是我们怎样才能学好英语。
