Zhang Wenju, a young teacher and leader of the university volunteer team, said starting the lessons was a "last-minute decision".

When the team came to Lushan High School on Sunday, they saw many children fooling around on the playground, looking upset and lonely.

"We thought, Why not set up a temporary class to gather these kids?" said Zhang, who also worked as a volunteer teacher during the Wenchuan earthquake five years ago. Classes began four hours later in one of the two tents from the university.

Michael Kleinert, another international student from Oklahoma in the United States, led the class activities with Frentz.

"The students were upset, and some of them were crying. That's why we try to make them excited," the 21-year-old said.

Zhang Xinwei, a college junior, taught students how to work together.

"I hope the youngsters who receive our help can offer helping hands to people in need in the future," he said.

In the daytime, the tent serves as the classroom. It serves as a "dorm" at night.

"When I was sleeping in the tent, I was woken up by aftershocks 15 times on Saturday night, the first night we arrived here, and 10 times last night," Frentz said, adding that one aftershock on Sunday night was strong enough to send everyone running from the tent.

Frentz said some of his friends asked him not to go because of the danger.

"If I didn't come, I'd regret it for the rest of my life," Frentz said, adding that his parents are very supportive.

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