Do: study/practice the grammar tenses
Get into groups of two.
Round 1. One person explains the grammar rules of the tense on the board. Everything about it! The formula, the signal words, why we use it, etc!
Round 2. Once the beeper goes, the other person writes down three examples of the tense on the tiny white board. One normal, one question, one negation.
Round 3. The first person checks the sentences and adds signal words.
Switch roles for the next tense!