He didn't leave here until the rain stopped.在这句话中为什么用leave 而不用left?

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He didn't leave here until the rain stopped.在这句话中为什么用leave 而不用left?
He didn't leave here until the rain stopped.
在这句话中为什么用leave 而不用left?

He didn't leave here until the rain stopped.在这句话中为什么用leave 而不用left?
用了助动词的情况下,动词都会还原为原形.在否定句和疑问句里常用.

前有didn’t 所以之后的动词必须还原