be reluctant to be famous for 這種片語中間為什麼都是用形容詞?

In the sentence pattern:-S-V-Subj complement where the sc is either adj. or V to be or be reluctant, hence reluctant.
reluctant is an adjective to do something, or slow to act as an actor because unwilling, sex, or disinclined to offer resistance, etc.as an actress.
eg:-She seems reluctant to act as an actor.
eg:-She is reluctant to be famous for the Hollywood film star casting.
Since relutant is an adj in this type of pattern phrase, then it is an adjective.

形容詞(例. reluctant, famous, ……)除了修飾名詞之外，大多是作為主詞補語(S.C)，也就是常以英文五句型的第二型：S + V + S.C 出現。其中的V，大多是be動詞。
所以，形容詞片語大多是如：be reluctant to, be famous for, ……。
例1. She was reluctant to go to college.
例2. a reluctant consent
例3. London was once famous for its fogs.
例4. My city is famous for its fireworks.
例5. a famous golfer

因為有 be動詞
be reluctant
be famous