is in drivers seat

is in earnest

is in effect

is in error

is in fat city

is in favor of

is in flower

is in force

is in funk

is in habit of

is in harmony

is in high spirits

is in hog heaven

is in huff

is in keeping

is in limbo

is in line for

is in love with

is in mid air

is in mid-air

is in midair

is in need of

is in offing

is in on

is in operation

is in pain

is in place of

is in possession of

is in power

is in power of

is in quandary

is in receipt of

is in residence

is in running

is in saddle

is in same class as

is in same league

is in sequence

is in service of

is in session

is in suspense

is in sympathy

is in the air

is in the cards

is in the driver seat

is in the driver's seat

is in the drivers seat

is in the habit of

is in the offing

is in the power of

is in the running

is in the saddle

is in the same class as

is in the same league

is in the service of

is in the wind

is in to

is in to for

is in to one for

is in touch

is in touch with

is in tune

is in unison

is in vain

is in want

is in wind

is inaccurate

is inactive

is inadequate

is incarnate

is incensed

is inclined

is inclined think

is inclined to think

is included

is included in

is incompetent

is incorrect

is incumbent up on

is incumbent upon

is indebted

is indecisive

is indecorous

is indignant

is indolent

is industrious

is inefficient

is inert

is infatuated with

is inflamed

is inflated

is influenced

is influential

is informed

is infuriated

is inquisitive

is insincere

is insincere with

is instrumental

is insubordinate