A subordinator is a word that connects two parts of a sentence, like 'because', 'although', or 'when'.
Subordinators help to show the relationship between different parts of a sentence.
Examples:
I like ice cream because it is tasty.
Although it is raining, we will go outside.
When the sun sets, it gets dark.
I can't play outside because it is raining.
Although I am small, I am very strong.
When I grow up, I will be a firefighter.