The word syrup is an uncountable noun for a substance. Nouns for substances are not identified as separate objects; substance nouns are expressed as amounts or measures:
The plural form for a substance is reserved for 'kinds of' or 'types of'; example:
Molasses (no change).
the plural form of molasses is molasses
The noun molasses is a mass (non-count) noun, a word for a substance. Substances are expressed as some molasses, more molasses, a cup of molasses, two cups of molasses, bottles of molasses, etc.
Bridges is the plural form of bridge.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
The plural form of the demonstrative pronoun 'that' is those.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
It has no plural form.
The plural form of rung is rungs.
The plural form of parenthesis is parentheses.
The plural form of boy is boys.