- it's not rocket science
- it's not sb's day
- it's no use
- it's no use (doing sth)
- it's no wonder
- it's no wonder that
- it's now or never
- (it's) now or never
- it so happens that
- it's one thing to A another thing to B
- it's one thing to do A, it's another thing to do B
- it's one thing to do A, it's another thing to do B
- it's one thing to it's another thing to B
- it's only a matter of time
- it's only a matter of time before
- it sounds like a plan to me
- (it) sounds like a plan to me
- it's six of one and half a dozen of the other
- it's small wonder
- it's small wonder that
- it stands to reason
- it's/that's not my problem
- it's water under the bridge
- itsy bitsy
- itsy-bitsy