Collocations for innocent - adj.

be, plead
He pleaded innocent to the charges.

believe sb, presume sb
I had always believed her innocent.
The accused person should always be presumed innocent until proved guilty.

declare sb, find sb, prove sb
The court found her innocent of the crime.

completely, entirely, totally, wholly (esp. BrE)

of
I am totally innocent of this crime.

act (esp. AmE), appear, be, look, play, seem, sound
Stop playing innocent and answer my questions, please.

very
all, perfectly
She tried to sound all innocent as she asked the question.
The circumstance could be perfectly innocent, but suspicions have been raised.

relatively
apparently, seemingly

act, appear, be, seem
She was sixteen and sweetly innocent.

very
sweetly
deceptively
He came across as deceptively innocent and childlike.

sexually

sweet and innocent
Don't be fooled by them acting all sweet and innocent.

Innocent is used with these nouns:
child, citizen, civilian, enthusiasm, explanation, expression, face, friendship, fun, kiss, look, man, party, people, person, remark, soul, victim, youth