I have just posted practice sheets for the indicative mood of the regular verb for New Testament Greek (https://markfrancois.wordpress.com/language-resources/). The practice sheets provide a template for reviewing the verb λύω according to the six principle parts. In my opinion, this is the easiest way to review the indicative mood. Answers for the practice sheets can be found in David Alan Black, Learn to Read New Testament Greek (3rd ed.; Nashville, Tennessee: B&H Academic, 2009), 112-13.