The plural form is CAVES.
The definite article, "the" is always used with plurals, as the indefinite article, "a"/"an", implies singularity.
Plurals
No, because plurals do not need an apostrophe.
Forum is a singular. Forums are plurals.
Sulci is the plural of sulcus
pluralsThe word plurals is the plural of plural. As in: I answered the question about plurals to the person who didn't know that the plural of plural is plurals.
The plurals are boxes, sheep, and princes.
pluralsThe word plurals is the plural of plural. As in: I answered the question about plurals to the person who didn't know that the plural of plural is plurals.
The plurals can normally be indicated by 5s (fives) and 7s (sevens). Numerals and single letters were once accepted as exceptions to the rule that apostrophes do not form plurals.
Yes, it has.
It and you are pronouns!Their plurals are they/them and you.
towns
plurals
butterflies
The plural of "this" is "these."
pianos
Please explain what you mean by those terms, they don't mean anything to me (and I am British).