摘要:5.用and连接的名词通常是指不同的人或物.谓语动词用复数,但有时用and连接的名词表示同一个人或物.谓语动词就应该用单数. Air and water are necessary for us. 空气和水是我们的必须. His brother and sister are both workers. 他的哥哥和姐姐都是工人. The composer and singer is very famous. 这位作曲家兼歌唱家非常著名.(一个人.and前后只用了一个冠词) The composer and the singer of the song are here now. 这首歌的曲作者和演唱者现在都在.(两个人.and前后用了两个冠词)

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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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