b、肯定和否定句 I am (not) from London. He is(not) a teacher. She is(not) in the dining room. My hair is(not) long. Her eyes are(not) small.
c、 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.
我们现在学过的be动词大致分两类:is、am、are为一类,一般用于一般现在时、现在进行时和一般将来时中;was和were为另一类,一般用于一般过去时。