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 dog promptly dropped to a sitting position, his tail still wagging furiously.
Singular

Three hundred acres, that's a big place, lots of places to get lost.
Plural

Some letters came out of that machine fifty years before they were posted !'

Plural