advise 建议(动词)
"I advise you to buy a good dictionary."
advice 建议(不可数名词) 所以要用 some advice 或 a piece of advice.
"Let me give you some advice." "She gave me a very useful piece of advice: to buy a good dictionary."
很多人不喜欢不请自来的建议和意见,所以为了避免表错情给人以多事的印象,你可以用以下说法:
"You could always..." 你其实可以...
"Have you considered..." 你考虑过...
"Perhaps we could..." 也许我们可以...
"Do you think it's a good idea to..." 你觉得...好不好呢?