Answer:
Formal speech is the type of speech which is in the form of business, legal style mainly used for professional purposes. On the other side, Informal speech is used for casual or personal purposes.
Here the sentences are changed to formal styles from the above given statements.
- I am starving, I’m going to eat something and will cal you back.
- We have to complete this before we leave anywhere.
- Let me know if you need any help J.
- You are wrong, I have paid twenty-five bucks for that.