Yes. It is an adverb of degree, usually modifying adjectives.
No, it cannot be a conjunction. Mostly is an adverb.
It used to be both. Nowadays it is used mostly as an adverb.
The adjective large has the adverb form "largely" (which means mostly).
adverb or adjective
Yes, it is. Like its synonyms mostly and chiefly, largelymodifies an adjective or an adverb.
Adverbs mostly, but don't always, have the suffix -ly on the end.The adverb of ample is amply.
The word sparkle is a noun or a verb. There is an adjective (sparkling) and an mostly unrecognized adverb form, which is "sparklingly."
No, "low" is not an adverb. It is an adjective used to describe the degree of height or intensity of something.
Necessary is not an adverb: it is most commonly used as an adjective.
The word entreatingly is an adverb. You can easily tell if a word is an adverb as they mostly end in the suffix -ly.
winters are very cold
The correct spelling of the adverb is mostly (to a great extent, primarily).