that if 和if that

首先这两个呢,都不是词组.
第一个 that if 是that 加从句,+if
It tells you that if you purchase this chicken.
它会告诉你如果你买了这些鸡肉.
if that 是 if +从句
If that idea can be put into practice it will, indeed, be a revolution.
如果这种想法能够付诸于实践,这确确实实将会是种大变革.