fromEnglish Grammar Today
Advice/ədˈvɑɪs/is a noun and means a suggestion about what someone should do. It is uncountable:
Let me give you someadvice: stay away from Margaret.
Not:Let me give you an advice
She gave him a lot ofadvice, but I don’t think he listened.
Not: …a lot of advices…
If we want to useadvicein a countable way, then we use the phrasea piece of advice:
I have twopieces of advicefor you about the holiday.
We use the verbadvise/ədˈvɑɪz/to mean ‘to give someone advice’:
I stronglyadviseyou to lose weight.
They finally did what weadvised.