常见的情态动词包括：must; may; can; need
may:
否定:No,you may not
疑问：May I.
need：
否定:No ,you needn't.
疑问：Must I.（或者Need I.）
must
否定:No ,you needn't.（或者No ,you don't have to ）
疑问：Must I.
can
否定:No ,you can't.
疑问：Can I.
没有be动词和情态动词的句子变疑问句和否定句怎么变
常见的情态动词包括：must; may; can; need
may:
否定:No,you may not
疑问：May I.
need：
否定:No ,you needn't.
疑问：Must I.（或者Need I.）
must
否定:No ,you needn't.（或者No ,you don't have to ）
疑问：Must I.
can
否定:No ,you can't.
疑问：Can I.