误They asked me a good deal of questions.
正They asked me a good many questions.
析a good deal (of)应和不可数名词连用,修饰可数名词用a good many。
误Drink it down.It will do good for you.
正Drink it down.It will do good to you.
正Drink it down.It will do you good.
析“(对某人)有好处”可以说do sb good。如果间接宾语sb 后移,则应该加介词to而不用for。