和can't相等的三个单词的英文词组?

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和can't相等的三个单词的英文词组?

1.must not
2.may not
3.should not
4.not be able
例句
Sorry, I will not be able to attend your party.
抱歉,我无法参加你的宴会.(不必说明理由).

not be able

1.shouldn't
2.not able to
3.must't
Please believe me!!!!!!

not be able to
must't
should not