The singular form of were is was:
I was at the beach.
Jane was at the beach.
We were at the beach.
All of us were at the beach.
The exception is the singular you still uses were, it doesn't distinguish between the singular or plural of you:
When were you at the beach?
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "hypothysis" is "hypothesis."
A singular form of dice is a die
The singular form of Oases is, Oasis.
A pair of scissors is the singular form.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of feet is foot.
The singular form of "hypothysis" is "hypothesis."
The singular form is ombudsman.
it is already in its singular form.
The singular form is money.
The singular form is cuff.
The singular form is hilum.
The singular form in stimulus.
The singular form for the plural noun stories is story.
The singular form for the noun families is family. The singular possessive form is family's.
The form hypothesis is the singular form. The plural form is hypotheses.