Capital letters always start a sentence. A girl will run. The sentence started with A so it was capitalized. You always capitalize proper nouns peoples names, the names of the week, names of states, countires. All names.

You use capital letters at the beginning of sentences and as the first letter of proper nouns (name-nouns). Capital letters can be thought of to add emphasis to things. IF I TYPE IN ALL CAPITAL LETTERS, IT LOOKS LIKE I AM YELLING OR TRYING TO DRAW ATTENTION TO THE MESSAGE. It is a tool for writing which is important to master :) Hope this helps :)

Capital letters makes English clearer and easier to read and understand. They tell you when it's the beginning of a sentence, and help us distinguish between names and ordinary words. If we didn't have capital letters, reading English would be much harder work for us all. Be grateful for capital letters - they make life easier.

Capital letter help us to know the difference between proper nouns and regular nouns. They also help to show the beginning of a sentence. for example: i live in arequipa, peru. vs. I live in Arequipa, Peru. Some words are spelled the same but have different meanings and the capital letter helps us to know the difference. for example: polish - this word is a verb and tells us to clean silver items until they are shiny. but, Polish - this a word for a nationality, the people who live in Poland or things from Poland.