在日常对话中，向对方提出建议和忠告有这些较常用的说法：

should 应该，要
"You should try to practise English."
"You shouldn't eat too much.
" Why don't you 不如... "Why don't you join an English club?"

ought to应该
"You ought to read more." If I were you,

I'd 如果我是你，我就...
"If I were you, I'd watch more television."

suggest and recommend提议与推荐用动词分词
"I suggest visiting the Eiffel Tower." (连自己在内全部人都去)
或用从句 "I suggest that you visit the Eiffel Tower." (你们大家去我不去，只是提议)
或用名词 "I recommend the lobster." (这家餐厅龙虾做得好)

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？