This(这), that(那), these(这些), those(那些)这四个词在英语中为指示代词,其中,these是this的复数形式,those是that的复数形式。这四个词的常见用法就是接be动词做主语,如题目所举。下附例句:
This is a pen. (这是一支笔)
That is a bird. (那是一只鸟)
These are my friends. (这些(人)是我的朋友)
Those are her friends. (那些(人)是她的朋友)
需注意的是单复一致,即this和that 后只能接is/was等单数动词,之后也只能用单数名词,而these和those后的只能是复数动词和复数名词。
This is a dog.
That is a dog.
These are my pens.
Those are her books.
This is my friend Lingling.
… … a English book.
… … a apple.
That is a English book.
… … a apple.
These are my friends Lingling and Daming.
… … my books/apples
Those are Lingling’s books/apples