1. EXPRESS A COMPLETE THOUGHT
A SENTENCE MUST:
CONTAIN A SUBJECT
CONTAIN A PREDICATE
AND
EXPRESS A COMPLETE THOUGHT

2. Which of these are complete sentences?
When I go to the store
He grabbed his backpack before running to catch the bus
If you like ice cream and candy
Johnny and Sally ate their dinners quickly

3. And the answers are… When I go to the store
He grabbed his backpack before running to catch the bus.
If you like ice cream and candy
Johnny and Sally ate their dinners quickly.

4. Common Grammatical Errors
Sentence Fragment – lacks a subject or predicate or is not a complete thought
Run-on Sentence – comes in one of the two following forms:
Comma Splice – two simple sentences joined ONLY by a comma (no FANBOYS)
Fused Sentence – two simple sentences joined with NO punctuation.