Singular vs Plural – Are Glasses Referred to as ‘It’?

I'm going to shamelessly repurpose the comments to answer this question:

(FumbleFingers) Some words, such as trousers, glasses, scissors, are semantically singular, but syntactically plural. Others, such as rickets and measles, are semantically and syntactically singular. I suspect you may just have to learn these on a case-by-case basis. But many of the first group can be identified because they're often used in expressions like a pair of [glasses, trousers, scissors]. So your sentences should be:

My glasses were lying on the table

My trousers are torn

These binoculars were gifted to me

Side note:

(rjpond) "Measles" (and other diseases) can be singular or plural. The OED says "usually" singular. Collins says "singular or plural". It's easy to find recent examples of it taking the plural. E.g. Leslie DeLong & Nancy Buckhart, General and Oral Pathology for the Dental Hygienist (2007): "German measles are mostly commonly found in children or adults who have not been vaccinated or exposed...".

Side note #2: FumbleFingers says that "these binoculars were given to me" is more common than "these binoculars were gifted to me". I actually prefer to use "to gift" as a verb where appropriate, so it's likely just personal choice.

I think that you have misunderstood the meaning of very. Here is the entry from the Cambridge Dictionary:

(used to add emphasis to an adjective or adverb) to a great degree or extremely

If you want to say "a lot of", you do not use very: you use "a lot of" in informal conversation, or many (for countable things) or much (for uncountable things)... and many/much/a lot of must be followed by a noun.

Deciding whether an adjective is gradable is not an exact science. There is no complete list of ungradable adjectives, dictionaries do not carry this information, and, as this Ngram graph shows, usage has changed over the past 200 years. In 1850, it was perfectly acceptable to say "very perfect" or "very excellent", whereas those expressions are not regarded as acceptable in modern English.

It is possible that our perception of gradeability has changed, but it is more likely that using very with a non-gradable adjective was considered reasonable then, but is now considered over-dramatic.

As a general guide, an adjective is considered ungradable if something is either X or not-X. For example, true is ungradable- something is either true or it's not. You will still hear people say "very true", though.

On the other hand, with an adjective like cold, there are varying degrees of coldness, and so it is gradable.

Adjective for parts of the body are definitely ungradable: something is dorsal if it relates to the back, and it's not dorsal if it doesn't relate to the back. There is no in-between.