The initial idioms of the letter I

accompany on a musical instrument	instrumental in doing
insulate against	insult
insure against	insure with
insure	insy
integrate into	integrate with
integrate	intend as
intend for	intend
intense	intent on
intent on doing	intention
intent	inter in
interact with	intercede
interchange with	interest in
interesting	interest
interface with	interfere
interfere in	interfere with