误We saw a thick black smoke coming out of the window.
正We saw thick black smoke coming out of the window.
析smoke作名词表示“烟”时不可数,前面不能直接用不定冠词修饰。
误To smoke is prohibited here.
正Smoking is prohibited here.
析说“禁止抽烟”的“抽烟”是泛指,应该用smoking。但当具体地指某人抽烟时,多用动词不定式。如:It is not very good for you to smoke so much.抽烟多对你身体没有好处。