The past tense of step into someone's shoes is stepped into someone's shoes.
The third-person singular simple present indicative form of step into someone's shoes is steps into someone's shoes.
The present participle of step into someone's shoes is stepping into someone's shoes.
The past participle of step into someone's shoes is stepped into someone's shoes.
Win Amazon gift cards by writing simple stories at Fictish, a new story writing game backed by WordHippo.