am
I’m Chinese;
I'm 21 (years old);
I'm fun;
is
My name is GaoXing;
My favorite food is apple;
My father is a doctor;
are
My favorite sports are basketball and swimming;
| 肯定 | 否定 |
| ------------------- | ----------------------- |
| I am | I am not || (he、she、 it) is | (he、she、 it) is not |
| (we、they、you) are | (we、they、you) are not |
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