No. It is a past tense form of the auxiliary verb "can." It is often used for polite requests, reluctant replies, or theoretical future actions, indicating an ability, as with can.
Examples:
Could we get a drink?
You could do that, but it probably won't work.
I could try again tomorrow.
No, agree is actually a verb. However, you could make it an adjective by saying "agreeable." The past participle can also be an adjective (the agreed boundary).
it could be pity, probity, enmity etc
Yes, an adverb can modify an adjective. For instance, you could say "I saw a very fast runner." Very, an adverb, modifies fast, an adjective. Another example is "The shelf is too high" where too (adverb) modifies high (adjective).
No, annihilates is a verb, as in he/she/it annihilates. 'Annihilated' could be used as an adjective, as in 'The Annihilated Self', or 'annihilating', as in 'the annihilating effects of space travel'.
The word "dark" is an adjective.An example sentence with this word is:It would be really helpful if humans could see in the dark.
if you were discribing a noun it could be an adjective.
big is an adjective but to add another adjective you could say extremely big.
No, it is not an adjective. Couple is a noun, or more rarely a verb. Coupled could be an adjective.
No. Although bluish could appear to be modifying white as an adjective, bluish is an adjective and white could be a noun (a color) or adjective (colored).
An adjective for someone who is rich could be wealthy.
One adjective for "signify" could be "meaningful."
no
An adjective for the noun quiver could be violent--a violent quiver.
The adjective for lightning is "lightning." For example, you could say "a lightning storm" or "the lightning bolt."
No, the word snake could be a noun or a verb, but not an adjective. And second of all, what's with the grammar? A adjective?
Yes, peaceful is an adjective. The noun form could be peace or peacefulness.
No, Intent is a noun. An adjective form of the verb (to intend) could be intended.