linking
"Had become" is a verb phrase where "had" is an auxiliary (helping) verb and "become" is the main verb. The auxiliary verb "had" indicates the past perfect tense.
will become, shall become, (am/are/is) going to become,
verb
A linking verb.
A linking verb
It is an irregular verb.
The verb appear can be a linking verb or an action verb.
Become isa verb.The forms are:base verb = becomepast = becamepast participle = becomepresent participle = becoming
An auxiliary verb
the infinative
Is becomes a verb
It is a regular verb