Writers often include small ifs in a character's speech to hint at doubt without stating it outright.

There were no ifs or buts about her decision.

There are some big ifs in the plan that could derail the whole project.

We can't sign the agreement with all those ifs, ands, or buts.

The study showed that ifetroban significantly reduced thromboxane-induced platelet aggregation in the experimental model.

In the laboratory, researchers found that ifenprodil reduced excitotoxic neuronal death by acting as a selective inhibitor of the NMDA receptor.

When chemists see the suffix -ifene at the end of a compound name, they know it denotes a clomifene- or tamoxifen-like antiestrogen.

They worked ifere through the night to finish the harvest before the storm arrived.

Ifen you finish your homework, we can watch a movie.