Please edit the sentence

[NewHopeR]

I've forgoten to learn english last night as usual I have.

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In my opinion, it has to use past tense when an adverbial of time (in this case, "last time") was used. In addition, "as usual I have" is not better than "as I usually do."

Do you agree with me?

[5jj]

I've forgoten to learn e English last night as usual I have.

In my opinion, it has we have to use past tense when an adverbial of past time (in this case, "last time") was as used. In addition, "as usual I have" is not better than is wrong; "as I usually do" is correct.

Yes, although 'learn English' sounds a little unnatural in this context. We would probably say something like:

I forgot to do my English homework ...
I forgot to learn my English vocabulary ...
I forgot to prepare for the English test...

[NewHopeR]

Thank you.

But I don't understand why "was used" is wrong while "as used" is right there.

Because "was used" can serve as the predicative, while "as used" is just an adverbial.

[5jj]

But I don't understand why "was used" is wrong while "as used" is right there.

Sorry. Typo . I intended to write 'is used'.