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.

I can't float it up now, the turbulence up there must be terrific !'
Singular

The metal tube slipped and he fell back and rolled into the Irishman's lap.
Singular

Others have tried... but they didn't know the secret. "

Plural