In recent decades it has been increasingly recognized that the forms of the verb in ancient Greek, including that of the New Testament, do not signal time (past, present, future), but aspect (the way each activity is viewed in relation to its context). Applying the new insights, this book offers a concise and clearly stated account of the way the verb works in the syntax of New Testament Greek. Its approach is pragmatic, with emphasis on context rather than theory. It can be read as a coherent account, and its four indexes also make it a handy reference book.
If you want to sharpen your grasp on NT Greek verbs and have to choose between Porter's Idioms of the Greek New Testament, Wallace's Greek Grammar Beyond the Basics, and this, I enthusiastically recommend this book to you. The explanations are very clear, and the examples from the NT itself aplenty. I guess it wouldn't hurt those who have completed/are taking third semester NT Greek to read this one straightaway.