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Do-現在式
Eg, I do my homework everyday.
I do not like to eat spicy food.

Did-過去式
Eg, I did the housework yesterday.
I did not go out with him last Sunday.

did is past tense , do is present tense

did係past tense
do係singular present tense
(do+es即does係plural present tense)

did係形容過去既事．
而do係形容現在既事，或者事實（ｆａｃｔ）

did is past, do is present