You should study hard at English(no matter)you are good at it(or not).
no matter 无论，不管的意思
or not 放在句尾，表示和前半句相反的意思。
You should study hard at English(no matter)you are good at it(or not).
You should study English hard , no matter what is your lever of English.
whether or not
whether or not
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