all it's cracked up to be

if it's all the same

If it makes no difference; if nobody minds; if it doesn't bother anyone.

it's about time

Used to express impatience at the eventual occurrence of something that the speaker or writer has deemed to be long overdue.

it's all good

Used to express unconcern.

it's all Greek to me

I don't understand any of it; it makes no sense.

it's early days

Indicating it is too soon to know the outcome of a situation, often implying it is too early to make a judgment or prediction.

it's five o'clock somewhere

Used as an excuse for drinking alcoholic beverages outside of customary hours.

it's none of your business

It's a matter (especially a private or personal one) that you are not entitled to be involved in or informed about.

kick a dog when it's down

To make things worse for someone in an adverse situation.