I do not know whether this theory is true.
I don't know if the theory is true.
I know that the theory is true.
Stern's program is kind, safe for work and respectful at all times.
A man can't play his electric guitar because it is broken.
The company refused to pay for any of the production costs.
A young boy was putting away a trainset.
The service of justice is quite easy.
A person is sleeping.