When writing a list of subjects, use commas: Math, English, Science.
When telling a story, use periods to finish your sentences: I went to the market. I bought fruits.
When asking for help, use question marks: Can you help me?
She is happy I like pizza
She is happy. I like pizza.
Are you coming
Are you coming?
I like apples bananas oranges
I like apples, bananas, and oranges.
Punctuation helps to clarify meaning and separate ideas in writing.
Use a comma to separate items in a list or before conjunctions in a sentence.