Protasis

Protasis

A protasis is a part of conditional sentence where it states a condition that must be met for a certain consequence or result to occur. The result of protasis is apodosis.

Example

If I study harder, I will pass the exam.
If I study harder is protasis and I will pass the exam is apodosis. 

Reference

Crystal, D. (2008). Dictionary of Linguistics and Phonetics (6th ed.). Oxford Blackwell.