forget doing sth和forget to do sth有什么区别?

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forget doing sth和forget to do sth有什么区别?
forget doing sth和forget to do sth有什么区别?

forget doing sth和forget to do sth有什么区别?
forget doing sth
忘记做过某事
forget to do sth
忘记要做某事

forget doing sth 忘记做过某事
forget to do sth 忘记去做某事
例如: i forgot doing my homework.我忘了我做完作业了
i forgot to do my homework.我忘记去做作业了

一个是忘记作某事,一个是忘记作过某事。

forget doing sth是事情已经做了,但事后忘了曾经做过。如
Oh,I forgot posting the letter!噢,我忘了信已经寄出去了。(信已寄出,说话人事后忘了)
forget to do sth是事情没做,忘记了。如
Don't forget to buy some salt.别忘了买些盐。(盐还未买来,这是说话人在嘱咐对方)...

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forget doing sth是事情已经做了,但事后忘了曾经做过。如
Oh,I forgot posting the letter!噢,我忘了信已经寄出去了。(信已寄出,说话人事后忘了)
forget to do sth是事情没做,忘记了。如
Don't forget to buy some salt.别忘了买些盐。(盐还未买来,这是说话人在嘱咐对方)

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forget doing sth ”忘记做过某事” 即这件事做了,忘了.比如:I forgot locking the door.(我忘了我锁上门了)
forget to do sth ”忘记做某事”即这件事忘了做了,还没有做.比如:I forgot to lock the door.(我忘记锁门了)