2019初中英语语法知识

b、as起连接作用，表达说话人的观点、看法，并指出主句内容的根据或出处，意为 正如，正像 。 Which相当于并列句，可以用and this来代替，意为 这一点，这件事 。 注意：as常用于下列结构：as we know/ as is known to all, as we all can see, as has been said before/above, as might be excepted, as is often the case, 一般不能用which代替as。 c、在从句中作主语时，which既可作系动词be的主语也可作实义动词的主语，而as只可作系动词be的主语。