No.Because happily is adverb
Happily is an adverb.An adverb describes a verb (a doing word.)
Where did you attend college? (You did attend college where?)where - adverb, modifies the verb 'did attend';did - auxiliary verb;you - personal pronoun, subject of the sentence;attend - main verb;college - noun, direct object of the verb 'did attend'.
Must is a modal auxiliary verb and attend is a main verb.You could call must attend a verb phrase.
To attend something would be an action, so yes, it is a verb.
What college did he attend? (He did attend what college?)what - interrogative pronoun, functioning as a determiner;college - noun, direct object of the verb 'did attend';did - auxiliary verb;he - personal pronoun, subject of the sentence;attend - main verb.
Attend is already a verb because it is an action. As in "to attend something".Other verbs are attends, attending and attended."I will attend the meeting"."We are attending the party"."They attended the photoshoot".
The tense of the verb "attend" is future tense.
The verb "attend" can be singular or plural depending on the subject it is paired with. For example, "she attends" is singular while "they attend" is plural.
Attendance is a noun. Attend, attended, attending are verbs.
In this sentence, 'attend' is used in the future tense.
Happily is an adverb.