Based on standard unit materials, here is a feature to help you prepare: Part 1: Grammar (Present Perfect vs. Simple Past)
Recognizing "extreme" sports or "exotic" foods in reading and listening passages. Grammar Mechanics four corners 3 unit 4 quiz
: Using have/has + past participle for unspecified past times, and contrasting this with the simple past for specific dates/times. Based on standard unit materials, here is a