The meeting was emotional , and Cindy drove home in a daze. Dependent words show the relationship between a dependent clause and an independent one. Use a comma when the dependent one comes first. She waited for the light to change while horns honked behind her. While horns honked behind her , she waited for the light.
Transitional expressions show the relationship between ideas in separate independent clauses.
Put a period or semicolon between the two dependent clauses, and put a comma after the transitional expression. Suddenly she realized it was a flashing light . However, it was too late to move.