'To buy' is a verb, as is 'To want'.
pick out If you pick out the book you want I will buy it for you.
Buyed is not a word in any language. But the past tense of buy is bought not Buyed though.
Yes, "will buy" is the future tense of the verb "buy".
'buy' is the verb.
want is something we do, we want things, so want is a verb.
The words "would want" is a verb phrase: helper verb would and main verb want.
By is not a verb so it doesn't have a past form Buy is a verb. The past of buy is bought
The word bought is a past tense verb, not a noun. There is no plural.
A helping verb has no meaning on its own. The word want has a meaning, so it is not a helping verb.
The verb you want is occur.
No it's a noun. Do you want to go carolling? - verb is 'want to go' Carolling is good fun - verb is 'is'
Want is a regular verb.