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 tip of a branch must have slicked straight through to his gums.
Singular

Several minutes later, footsteps sounded across the wooden floor, and Noah joined me at the window.
Plural

When my tender skin has toughened enough to withstand the pressure of sheets, more visitors arrive.

Plural