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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Hedidn''tleavehereuntiltherainstopped.在这句话中为什么用leave而不用left?Hedidn''tleavehereuntiltherainstopped.在这句话

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