be动词 / 助动词后面加not
It is not my fault. 那不是我的错。
They were not happy with the result. 他们对结果不满意。
Robert doesn't believe in God. He is a Buddhist.
I don't have brothers or sisters. I am the only child in my family.
Sean didn't study at all last night. He didn't pass the history test today.
I'm afraid that the rain will not stop in twenty minutes.
I dare not go out alone after midnight. 午夜后我不敢一个人外出。
You should not hang around outside after midnight.