Sentences can end with a period, exclamation point, or question mark. A sentence normally ends with a period while statements about studying, intelligence, speed, and color typically end with a period. Proper punctuation is important for writing clear and grammatically correct sentences.

1. A sentence ends with a period (.), and exclamation point (!), or a question mark (?).
A sentence normally ends with a period (.).
I study English.
She is very smart.
The car goes 40 miles per hour.
The cat is black.

2. Information taken from: Hogue,A. (1996). First steps in academic writing. Longman: N.Y.