A small thing, in English, we almost always put a space after a comma. We almost never put a space before a comma. The same is true for periods. So: Before you go home, buy me a cake.

In my opinion , you should stay here until I come back. (GOOD) We walked across the bridge and went through the forest. (GOOD) My mum is silly , but she treats people friendly. (My mom is silly, but she treats people kindly) We knew each other five years ago. (We met each other five years ago. OR We have known each other for five years) Your father called you five minutes ago. (GOOD) Before you go home , buy me a cake . (GOOD, but usually we would include "please") He forgot that he had made a deal with me before. (GOOD)

Hello, All look good to me except the third one: My mum is silly , but she treats people friendly. Suggestions: My mum is silly, but she treats people kindly. My mum is silly, but she is friendly with people.