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.

阅读短文，在其后空白处写出各单词的正确形式。单词的第一个字母已经给出。

    The　worst　traveler　in　the　world　was　Paul　of　San　Francisco.　Once　he　f____1.　from　the　U.S.　to　his　hometown　in　Italy　to　see　someone　at　home.　The　plane　made　a　one-hour　stop　to　get　oil　at　an　airport　in　New　York.　Paul　thought　he　was　in　Rome.　C____2.,　he　got　off　the　plane.

    When　nobody　was　there　to　meet　him,　Paul　thought　maybe　the　heavy　t____3.　made　his　friends　late.　While　looking　for　their　address,　Paul　found　that　the　old　“Rome”had　changed　a　lot.　He　found　many　high　m____4.　buildings　instead　of　old　ones.　He　also　found　that　many　people　spoke　English　but　not　Italian　and　that　many　street　signs　were　w____ 5.　in　English.

    Paul　knew　very　l____6.　English.　So　he　asked　a　policeman　in　Italian　the　way　to　the　bus　station.　He　happened　to　meet　a　policeman　who　was　also　born　in　Italy　and　answered　in　the　same　l____7..

    After　twelve　hours’ traveling　round　on　a　bus,　the　driver　handed　him　over　to　a____8.　policeman.　But　this　time,　this　policeman　could　only　speak　English.　So　paul　asked　the　policeman　why　the　Rome　police　employed（雇佣）so　many　people　who　spoke　English　as　policemen.

    Paul　didn’t　b____9.　he　was　in　New　York　when　he　was　told　so.　To　get　him　on　a　plane　to　Italy,　he　was　s____10.　to　the　airport　in　a　police　car.