Complementizer

Okay kiddo, so you know how we use words like "that" or "if" or "because" to connect different parts of a sentence together? Well, sometimes we use a special kind of word called a complementizer to join two parts of a sentence that might not make sense on their own.

For example, let's say you want to tell someone that you're happy because it's sunny outside. You could say "I'm happy. It's sunny outside." But that doesn't really explain why you're happy. So instead, you could use the complementizer "because" to connect the two parts of the sentence: "I'm happy because it's sunny outside."

Complementizers can also be used to introduce clauses (which are like mini-sentences within a sentence). So if you wanted to ask someone if they're going to the park, you could use the complementizer "if": "Are you going to the park? If so, can I come too?"

Overall, complementizers are just special words we use to help connect different parts of a sentence together and make it easier to understand what we're trying to say.