四、指示代词

　　指示代词包括this， that， these， those 和such， 在句子中可以作主语、定语、表语、宾语等(such不作宾语)。

　　that和those有时分别用来代表前面提到的不可数名词和名词复数，以避免重复。而可数名词单数往往用the one 或that one 来代替。用the one 的时候更多一些。如：

　　These machines are better than those we turned out last year. 生产

　　The oil output of this year is much higher than that of last year. 产量

　　The best wine is that from France.

　　My room is lighter than the one next door.

　　I'll take the seat next to the one by the window.

　　The film is more funny than that one.

　　that 可以指上面提到的事情，this指下面要谈的事情。如：

　　They have no time to read the books. That's their trouble.

　　She was ill yesterday. That's why she was absent.

　　What I want to say is this： Pronunciation is very important in learning English.

　　this 和that 有时还可以用来表示程度。如：

　　I don't want that much.

　　The book is about this thick.

　　五。疑问代词

　　疑问代词包括what， which， who， whom， whose， 可以用来构成特殊疑问句，也可以引导名词从句。 What， which， who在句子中作主语或宾语，whom作宾语，whose作定语。如：

　　Which do you prefer， the yellow one or the white one? (宾语)

　　What's your sister?(表语)

　　The man who is talking with my mother is an engineer.(引导定从句)

　　The old man whose son is studying abroad is our formal dean of the department. (引导定从句)

　　I don't remember whom I have lent my dictionary to. (引导宾语从句)

　　疑问代词what， which， who， whom后面可以加ever来加重语气。如：

　　Whoever can be calling at this time of the night ?谁这么深更半夜来找人?

　　I'll say whatever comes into my head.

　　Take whichever book you like.