Use the preposition for as it means intended or to be given to.
2. I sudmit my homework
I submit my homework.
Please double check your spelling. Submit is spelled s-u-b-m-i-t.
3. he is gossipmonger
He is a gossipmonger.
Capitalize the first letter if your sentence.
Use the article "a" before the word "gossipmonger" as it is a count noun and begins with a consonant letter.
4. she is big mouth
Shehas a big mouth.
When you make a sentence don't forget to start the first word in big letter and it should end with a period (.).
Big mouth is a noun. Use "has a" instead of the -be verb "is." When someone has a big mouth, it means that he/she often say things that are meant to be kept secret.