Zero considered go to the city or go back to camp.
Zero considered going to the city or going back to camp. / Zero considered whether he should go to the city or back to camp.
After run away from the Warden, he slipped onto the bus unnoticed.
After running away from the Warden, he slipped onto the bus unnoticed. / After he ran away from the Warden, he slipped onto the
The campers should spend some time doing works, and some time studying.
The campers should spend some time doing work, and some time studying.