what did he say? what did he tell you?为什么“say”和“tell”不用过去式,“said”、“told”?

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what did he say? what did he tell you?为什么“say”和“tell”不用过去式,“said”、“told”?
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what did he say? what did he tell you?为什么“say”和“tell”不用过去式,“said”、“told”?
what did he say? what did he tell you?
为什么“say”和“tell”不用过去式,“said”、“told”?

what did he say? what did he tell you?为什么“say”和“tell”不用过去式,“said”、“told”?
do/ did 是助动词,助动词后面的动词(像你说的say和tell) 都是原形,不需要变成过去式.
e.g.What did he do last night
Why did she laugh

前面的助动词“did”是用过去式,后面要加动词原形的