Solving a quadratic equation is difficult.

Solving a linear equation is difficult.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.

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

Will you marry me?

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

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.