We (have been) good friends since we met at school.为什么用have been?还有Why not (go) to the cinema with me?为什么用go?

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We (have been) good friends since we met at school.为什么用have been?还有Why not (go) to the cinema with me?为什么用go?
We (have been) good friends since we met at school.为什么用have been?
还有Why not (go) to the cinema with me?为什么用go?

We (have been) good friends since we met at school.为什么用have been?还有Why not (go) to the cinema with me?为什么用go?
1.since we met at school ----since .一般和【现在完成时】连用.动词形式是 have/has+ 过去分词
2.Why not + 动词原形 表建议,是个固定句型