In hindsight
Thinking about the past with the knowledge that one now has.In hindsight, I knew that I had not done well in the job interview.
In high gear
Very fast and active.The preparations for the party were in high gear when I arrived at the house.
In heaven
In a state of absolute happiness, dead and in heaven.I felt that I was in heaven when I learned that I would get the job that I wanted.
In hand
Under control.The teacher had the class in hand when the principal came to visit the classroom.
In great demand
Wanted by many people.The young pianist is in great demand by symphony orchestras around the world.
In good with (someone)
In someone's favor.My cousin is in good with his boss and he has an easy time at work.
In good time
A little early, sooner than necessary.I will try and get the information to you in good time so that you can decide what to do.
In good spirits
Happy or cheerful or positive.Everyone was in good spirits when they went to the beach for a picnic.
In good shape/condition
Functioning or working well, in good physical condition.The old man was in good shape.
In good repair
In good condition.My car is always in good repair when I leave for a holiday.