The heliocentric theory is the idea that the sun, not the earth, is the center of the universe.

He believes in the geocentric theory.

He is spending a lot of time on experimental research.

Will you marry me?

"Do you want to have a meal? Take a bath? Or choose me?" she said jokingly.

She used to be a prostitute, but now she has started a new life.

He was hiding the fact that he was an illegitimate child.

I'm sorry, but I don't speak Japanese.

I'm a Muslim, so I fast during Ramadan.

I'm Jewish.