be 动词的用法一、口诀:我用 am, 你用 are, is 用在他她它,复数全用 are
I ______ a boy
______ you a boy
No, I _____ not
The girl______ Jack’s sister
The dog _______ tall and fat
The jeans ______ on the desk
二、有 be 动词的肯定句和否定句 I am from London
I am not from London
He is a teacher
He is not a teacher
She is in the dining room
She is not in the dining room
My hair is long
My hair is not long
Her eyes are small
Her eyes are not small
归纳:在有 be 动词的句子中,改否定句时只要在 be 动词______加上_____
三、有 be 动词的一般疑问句 Am I a Chinese
Yes, you are
No, you aren't
Are they American
Yes, they are
No, they aren't
Is the cat fat
Yes, it is
No, it isn’t
四、 Be 动词在一般过去时中的变化:am-—was is -—was are--were ⑴am 和 is 在一般过去时中变为 was
(was not=wasn't)are⑵在一般过去时中变为 were
(were not=weren’t)⑶ 带有 was 或 were 的句子,其否定、疑问的变化