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.

根据句意和首字母或汉语提示，将单词的正确形式写在题中相应的横线上。

1.I hope to go to Taiwan one day to enjoy the b______________ sights there. 

2.He is too fat. His mother asks him to eat more vegetables and l______________ meat.

3.She was very ill, but ______________（幸运地）she is now out of danger.

4.We will have a meeting on ______________（周四）afternoon.

5.It is well-known that there are four ______________（季节）in a year.

根据句意和首字母或汉语提示，将单词的正确形式写在题中相应的横线上。
【小题1】I hope to go to Taiwan one day to enjoy the b______________ sights there. 
【小题2】He is too fat. His mother asks him to eat more vegetables and l______________ meat.
【小题3】She was very ill, but ______________（幸运地）she is now out of danger.
【小题4】We will have a meeting on ______________（周四）afternoon.
【小题5】It is well-known that there are four ______________（季节）in a year.