Why is he laughing? (use "because of" to answer)
He is laughing because of the minion.
Why does she have a stomachache? (use "because of" to answer)
She has a stomachache because of eating too much.
Why can't she sleep? (use "because of" to answer)
She cannot sleep because of the music.
Why is he absent from school? (use "because of" to answer)
He is absent from school because of the flu.
Why did the grass die? (use "because of" to answer)
The grass died because of the lava.
Why is he not moving? (use "because of" to answer)
He is not moving because of the cold.
Why are they closing all windows? (use "because of" to answer)
They are closing all windows because of the snow.
Why are you crying? (use "because of" to answer)
I'm crying because of the (sad) movie.
Why is the water polluted? (use "because of" to answer)
The water is polluted because of the trash.
Why was school closed? (use "because of" to answer)
School was closed because of the flood.
Why do they go swimming? (use "because of" to answer)
They go swimming because of hot weather.
Why did she stay up late to study? (use "because of" to answer)
She stayed up late to study because of the exam.
Why did people evacuate? (use "because of" to answer)
People evacuated because of the tornado.
Why can't people see? (use "because of" to answer)
People cannot see because of the ash.