Hey Tayscaggs. The format of the lessons and what you're supposed to teach goes like this:
Class 1: Look and Listen, Listen and Repeat, Let's Play
Class 2: Look and Listen, Listen and Repeat, Let's Chant, Let's Play
Class 3: Look and Speak, Let's Sing, Let's Write
Class 4: Let's Role Play, Let's Review
You're right that there's no way any of those can take up 40 mins (except maybe class 4). I think I can usually get 25 minutes on average out of each day's textbook material and even that is with a lot of repetition and the game being stretched out to 12 minutes.
The best thing to do is to establish some sort of routine that you do every class. It will take up time and kids can learn a lot through repetition. For example, last semester I started every class with a song. I would use the same song for about 3 weeks (so each class saw it 6 times) before switching it. I used songs like "Hello, Goodbye" by the Beatles, "Itsy Bitsy Bikini" (co-teacher's choice). Then afterwards, I asked them questions. "How are you?" "How's the weather?" Stuff you can ask every day. Then I said, "What did you do yesterday/What will you do this weekend?" I walked up to every kid who put up their hand and gave them a little paper slip when they answered. That was the routine at the beginning of every class and it lasted about 8 min.
This semester, instead of a morning song, my CT has introduced tongue twisters to them. They get a new one each class that we practice and they glue it onto a sheet of paper. Then we have them say it again at the end of class individually to get a stamp.
I'm sure many people on this board have routines that they do in class. But with something like what I described + text book + 1 activity you get from here or somewhere else you should be fine for filling out 40 mins.