The singular is "pulley".
Pulleys is the plural form; the singular is pulley.
"Woman" is spelled as such when referring to one female individual.
That is correct. Company is the singular noun, and company's is the singular possessive.
MOVIE
woman
I spell it as T.Shirt when using it as a singular but t.shirt when used in a sentence.
The singular possessive is cabinet's (referring to one cabinet).
Bacteria is the plural; bacterium is the singular.
The singular is cigar and the plural is cigars.
Something that's singular is unique.
'Woman' in singular or 'women' in plural.
Wallaby in the singular, and -ies for the plural.