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brothers or sisters?(1) Basic form: am/are/is(2) 肯定和否定句 I am(not) from London.My eyes are(not) small.My hair is(not) long.(3)一般疑問句: Am I a Chniese? 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. be結(jié)構(gòu)肯定句:There is a …Thereare …一般疑問句: Is t