写作：
环境问题已经成为人们最关注的问题之一，低碳生活亦已成为人类共同关注的话题。请用英语为校学生会写一则宣传稿，号召全校师生都来关注环境问题，在保护环境、减少污染、节约能源方面作出贡献。作为学生，更要从身边的小事做起，如：
1．在购物时用布袋子而不用塑料袋；
2．尽可能地再利用旧课本；
3．使用纸的正反面；
4．……(2～3点)。
注意：
1．词数90左右，宣传稿的开头和结尾已给出，不计入总词数；
2．除上述所举之例外，要求能够联系实际，再举2～3例；
3．参考词汇：布袋子：cloth bag; 塑料袋：plastic bag; 再利用：reuse。
Water and air pollution are getting more and more serious. Each of us can do a little bit to help with this problem..                                                                   
                                                                                           
                                                                                           
                                                                                           
                                                              We believe that we can make our world a better place to live in.

写作：

环境问题已经成为人们最关注的问题之一，低碳生活亦已成为人类共同关注的话题。请用英语为校学生会写一则宣传稿，号召全校师生都来关注环境问题，在保护环境、减少污染、节约能源方面作出贡献。作为学生，更要从身边的小事做起，如：

1．在购物时用布袋子而不用塑料袋；

2．尽可能地再利用旧课本；

3．使用纸的正反面；

4．……(2～3点)。

注意：

1．词数90左右，宣传稿的开头和结尾已给出，不计入总词数；

2．除上述所举之例外，要求能够联系实际，再举2～3例；

3．参考词汇：布袋子：cloth bag; 塑料袋：plastic bag; 再利用：reuse。

Water and air pollution are getting more and more serious. Each of us can do a little bit to help with this problem..                                                                   

                                                              We believe that we can make our world a better place to live in.

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.