 Activity for teaching the present perfect, how many times since? Have your students come up with common daily activities and collect the responses on the board. Next, call up the students in turn, and ask them how many times they have performed this action since a certain point in time. For example, how many times have you brushed your teeth since last night? A student might answer, I have brushed my teeth twice since last night. Once the students feel confident, have them form questions with the vocabulary on the board and ask other students.