You had better not smoke in the room这句话为什么不用dont You'd better not to smoke in t...

you had better not\u53ef\u4ee5\u6539\u6210you had better dont\u5417\uff1f \u5982 you had better dont smoke in the room

had better\u5982\u540cmust\u4e00\u6837\uff0c\u5426\u5b9a\u5f62\u5f0f\u662f\u76f4\u63a5\u5728better\u540e\u9762\u52a0not.\u4e0d\u52a0don't.
You had better not smoke in the room.

had better not do something \u6700\u597d\u4e0d\u8981\u505a\u3002\u3002
\u540e\u9762\u4e0d\u52a0to

用yes的话是比较直接的，而you'dbetternot是比较委婉的建议。如果你很想表达自己对吸烟的不满就用yes但若你不想太直接表达自己的不满的话最好用you'dbetternot

扩展阅读：it is adj for sb to do ... i fell and hurt myself ... you had me at hello ... have problem to do ... at the sight of ... that is all right ... several times ... you complete me ... what should i do ...