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:
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.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "is" is "are."
The plural form of "I" is "we."
The plural form of "was" is "were."
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
The plural form of the demonstrative pronoun 'that' is those.
The plural form is metres.