用am,is或are填空,然后总结其用法。

(1)That's my father and this ________ my mother.

(2)This is my cousin and that ________ my sister.

  (3)-________she your sister?

  -Yes, she ________.

  (4)-And ________ he your brother?

  -No. He's my friend.

  (5)-________ Guo Peng your brother?

  -Yes, he ________.

(6)I ________ his friend. I'm not his brother.

  (7)-________ you Jack's brother?

  -No, I'm not. I ________ his cousin.

(8)These ________ my grandparents.

  (9)-________ this your aunt?

  -Yes, it ________.

(10)These ________ my parents, those ________ my grandfather and grandmother.

(11)These are my brothers. They ________ Jeff and Jack.

(12)They aren't my sisters. They ________ my friends.

am用于第一人称单数I之后;is用于第三人称单数ge,she,it以及相当于he,she或it;are用于第二人称或所有人称的复数,表达“是”的意思。可用下面的口诀来帮助记忆:“我用am你用are,is用于他她它,复数全都要用are”。

I am…可以缩写成I'm,he is可以缩写成 he's,she is可以缩写成加she's,it is可以缩写成it's,而we are,you are,they are可分别编写成we're,you're,they're。am,is,are的否定形式是在后面加not,如:am not,is not,are not。is not通常缩写为isn't,而are not通常缩写为aren't。如:

(1)I'm Alice, I'm not Mary. She's Mary.

(2)This isn't my brother. He's my cousin.

(3)They're my brothers. They aren't my friends.

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