영어 문법 가이드 Be:  현재 시제의 부정형Be:   Negatives in the Present Simple Tense
문법 -   Be :  부정형 are not is not aren't isn't 
SUBJECT  +  NEGATIVE BE 주어  +  BE  (부정문 )am not  → 'm not I  +  'm not I 'm not  an engineer.are not  → aren't /'re not You /We /They  +  aren't You  aren't  bad.is not  → isn't /'s not He /She /It  +  isn't He  isn't  at home.예 -   Be :  부정 축약형 S.  +  NEG. CONT. ... I 'm not a doctor. You  aren't bad. He  isn't at work. She  isn't in Boston. It  isn't a book. We  aren't in the library. They  aren't busy. 
We can contract the negatives are not is not 're not 's not 
S.  +  NEG. CONT. ... I 'm not a doctor. You 're not bad. He 's not at work. She 's not in Boston. It 's not a book. We 're not in the library. They 're not busy. 
⚠  조심하세요!am not  → amn't ✘ am not  → 'm not ✔ 
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