As a verb, the word think would be first and second person both singular and plural, but third person plural.
I think.
You think.
He thinks.
We think.
They think.
As a noun, it would be singular, however its use as a noun is very marginal.
I sat down and gave it a good think.
Unless you are trying to write the next Huckleberry Finn, don't use think as a noun.
Singular Plural is caterpillars
Steroids is plural. The singular form of the word is steroid.
The word crisis is singular. The plural form of crisis is crises.
Association is singular. Associations is plural.
its singular there is no plural form of rendezvous
I think it's singular. Because if it was boots, it would be plural.
i think it's singular
The word team is singular; the plural form is teams.
These is plural, this is singular
Lance is singular. Lances is plural.
The word 'Phenomenon' is singular. The plural form is 'Phenomena'.
The word metastasis is singular, metastases is plural.
The word "ground" can be both singular and plural. Singular: "The ground is wet." Plural: "The grounds of the park are well-maintained."
Louse is singular. The plural form is lice.
No, the word "list" is singular. The plural form of "list" is "lists."
It's singular. The plural is cafeterias.
Verbs cannot be singular or plural. Has is after singular nouns.