She's smiling because she's happy.

We're delayed because of traffic.

Ceremonies were curtailed because of snow.

We'll be late because of traffic.

I'm happy because I'm with you.

She's tired because of the journey.

He shortened the speech because of rain.

They arrived late because of traffic congestion.

They succeeded because of their hard work.

He's upset because he failed the test.

I can't go out because it's raining.

I'm tired because I didn't sleep well.

I'm reading this book because it's interesting.

I'm angry because you lied to me.

We laughed because the joke was funny.