If you're taling about a support or a brace, then it's stays
yes
The word crises is a plural word; it is the plural form of the word crisis.
"Told" is a verb. It is already in proper form to be used with a plural noun. Example: They told him to go home. We told him to stay.
There is no plural word for if.
The plural form for the demonstrative pronoun this is these.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
The plural word of delay is delays.
the plural word is comedones
No it's a singular word. A plural word would be "have".
Leukocytes is the plural of leukocyte
The plural noun is raisins.
The plural of "classification" is "classifications."