Full stops and capital letters

 

A full stop (.) comes at the end of a sentence. It shows that a sentence is completed and finished. It is followed by a capital letter to start the next sentence. For example,

There are twenty five students in my class. I am the tallest student.

Capital letters are used at the beginning of sentences. They are also used for days of the week, months of the year and for proper nouns, or names of things, people, places and titles. For example,

Monday

January

Mary Poppins

St Helier

The Lion King

Charlie and the Chocolate Factory

http://www.oxforddictionaries.com/words/punctuation

http://www.bbc.co.uk/skillswise/topic-group/sentence-grammar