如果……的话 （Conj.…P） "if …；in case of" 
   
    如果 here is used as a conjunction to imply a supposition or a condition, 的话，which can be omitted, is usually placed at the end. The clause with 如果 is normally followed by another clause, with (那)……就 to show the conclusion or inference.

               如果……（的话），（那）+Subj.+(就)+VP
Examples:
1. 如果你喜欢这个小古董(的话)，我就送给你。
If you like this small antique, I can give it to you as a gift.
2. 如果你们满意，那我们就成交了。
We'll close the deal if you are satisfied. 
           如果 sometimes can be replaced by 如 in written Chinese
Example:
3. 如果有时间，请告知。
Please let us know if you have time.

Substitutive drills: