Answer:
Formal Language:
- This is a serious problem.
- I hope to hear from you.
- Thank you for your time.
Informal Language:
- This is totally ridiculous.
- No way that's happening!
- You're the best!
Explanation:
We use Formal language when we are talking to people we do not know well, in formal situations and in academic speeches or texts. It is characterized by the use of complex sentences, lack of colloquial terms and the use of polite and formal expressions.
On the other hand, we use Informal language when we are talking to people we already know (our friends and family) in everyday situations. It's characterized by the use of simple and colloquial sentences, slang and lack of formal expressions and structures.
