In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.

The nurses gave them a lengthy list of places to try.
Plural

Ahead of the ship, the relatively calm seas were washing against slate grey rocks that rose seven or eight feet up out of the waters.
Plural

" Yes -- the preliminary tests show that the engines are operating better than we hoped. "

Plural

