You can't substitute money for health.

Pre-Greek is a substrate language hypothesized to explain certain Greek words of non-Indo-European origin.

The sub-occipital approach was used to remove the brain tumor.

His arts gave credence, and forced tears withal / snared us, whom Diomede, nor Achilles dire, / nor thousand ships subdued, nor ten years' war could tire.

The subject is different.

There are subjects that I avoid.

That's a very delicate subject.

Their views vary on the subject.

Did you subscribe to any newspapers or journals?

She has submitted her resignation.