Let's look at this sentence and make it easy to understand:
Sentence: 'With its long ladder and a big water tank, the fire engine helps put out fires.'
What the sentence is saying
- The sentence talks about a fire engine (the big red truck firefighters use).
- It tells us two things the fire engine has: a long ladder and a big water tank.
- Because of the ladder and the water tank, the fire engine helps put out fires — that means it helps stop fires so people and buildings are safe.
Why there is a comma
The part at the start, 'With its long ladder and a big water tank,' describes the fire engine. That description comes first, so we put a comma after it to show the description is finished and the main idea starts next.
How the ladder and water tank help
- Long ladder: reaches high windows and roofs so firefighters can rescue people and spray water from up high.
- Big water tank: holds water so the firefighters can spray a lot of water on the fire.
Try this
Look at a picture of a fire truck. Point to the ladder and the water tank. Then make your own sentence, for example:
'With its loud siren and bright lights, the fire engine drives to an emergency.'
Great job! You're learning how sentences tell us about things and why they use commas.