Use a reverse check:
Keep a “Mistake Log” with three columns: nihongo shoho answers
However, a word of caution: Why? Because the publisher protects these resources for instructors. Many so-called “Nihongo Shoho answers” on random forums are incomplete, user-generated, or flat-out wrong. Use a reverse check: Keep a “Mistake Log”
Te-form has multiple rules (う→って, く→いて, す→して). Seeing the correct answer side-by-side with your wrong one patterns the rule in your brain. nihongo shoho answers
Sometimes, native speakers or advanced learners will help you check answers. Try:
The "helpful feature" you are likely looking for refers to the supplementary materials and interactive tools designed to provide answers and practice for Nihongo Shoho
textbook is often used in classroom settings where instructors hold the keys. Essential Resource Guide