1. Complete the sentence with the correct tense form 1. He (to remember) that he (to leave) the hat at the cinema. 2. When I (to open) the door, the lesson (already, to begin) and the teacher something to the class. 3. What you (to do) yesterday at 6 p.m.? 4. He (to take) many photos by 4 o'clock. (to explain)