Should:
"You should try to speak English."
"You shouldn't speak too fast."

Ought to:
"You ought to read more English books."

Could:
"You could always find a English pan pal."
Why don't you:
"Why don't you join a English club?"
If I were you, I'd...
"If I were you, I'd English channel."

Recommending:
"I recommend you to watch 8 o'clock morning news."

Suggesting:
"My English teacher suggested me to buy a good English dictionary."

Advise:
"My father advised my little sister not to watch TV too much,"

Advice:
(Advice是一個不可數名詞。就是說我們不能說一個advice， 而要說some advice or a piece of advice)
"My grandma will give you some advice on this."
"Our teacher gave her a very useful piece of advice: to make a English Pan pal."

Remember 記住了:
大多數人不喜歡聽別人的建議和忠告。為了避免一開始就引起他人的反感，你可以這樣表達：
"Have you considered..."
"Perhaps you could..."
"Do you think it's a good idea to...?"　
"Would you mind if I say something...?"