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Conditional sentences. “If” (conditional) clause: “would”; main clause: future tense

As a refresher, a conditional sentence expressing something that might happen or something that is likely to happen in the future is called a predictive or a prediction conditional sentence. Generally speaking, the term “would” expresses something that has the capability of happening, but has not happened or is unknown if it will happen in the future. These sentences have the following form:

If + would + verb, will + verb

For example, consider the following sentences:

If you would only study harder, you will pass the class.
If you would only help in the kitchen today, I will cook your favorite meal tomorrow.

In these sentences, the speakers are advising their speakers that is likely for the condition to take place. The actuality of the actions depends on the conditions. Therefore, the actions are only likely to happen after the condition has taken place.

Sumber : http://www.grammarly.com/handbook/sentences/conditional-sentences/8/conditional-sentences-if-conditional-clause-would-/