advice的用法

 1. 是不可数名词，若表示一条或几条建议或劝告，要借用piece 这样的词：a piece of advice 一条建议 / two pieces of advice 两条建议 

2. 表示按照某人的意见做某事，一般要用介词 on 或 by：或It was done on [by] my advice. 这是按我的意见做的。
3. 表示提出建议或忠告，一般用动词 give；表示向某人请教或征求意见，一般用动词 ask (for)；表示接受意见或劝告，一般用动词take (follow, accept)：

He gave us good advice on how to learnEnglish well. 他对怎样学好英语给我们提了很好的建议。

He asked for the teacher’s advice. = He asked the teacher for hisadvice. = He asked advice of the teacher. 他向老师请教。

If we had followed his advice, we could have done the job better with less money and fewer people. 要是听取了他的意见，我们不仅可以节省人力、物力，而且还会把工作做得更好。