Shulk grabbed his stuff and headed straight to his next class, which was Math.

I looked at my schedule. My next class was Math. I walked across the hall to the next room.

Shulk sat down in the second row.

I sat down in the back row.

(There also isn't a teacher for this class.)
Shulk waited for the bell to ring.

(Got nothing off the top of my head for math. :/)
"Where's the teacher?" I asked.

"Beats me." Shulk answered.

"I'm here!" Aero panted, walking in. She got lost. (Even though the classes are literally two doors apart XD) She looked around for an empty seat.

"You're ok, the teacher isn't here to mark you tardy." Shulk said.

The students looked around awkwardly, awaiting the teacher to come.

Aero nodded and sat down at the end of the back row.

"Well this has gone on long enough." Shulk said. He stood up, walked over to the teacher's desk and read the lesson plan. He then walked to the front of the classroom. "Hello class. I am Shulk, your substitute math teacher." He said.

Aero stifled a laugh.

The rest of the class tried not to laugh.
I grabbed my Math book.

"Time for attendance." Shulk said. "Say here if you are here." Shulk said. He called out a bunch of names before saying Aero's.