stumbling

"He is a student of life."

"Instruction will be provided on how to handle difficult customers."

"The manufacturer will spanish the dashboard trim to give it a textured, non-slip surface. "

"They played long and hard."

"He stumbled over a rock."

"The complicated instructions for the new software program confused many of the employees. "

"The students' high scores on the math test were confounded by the fact that they all had access to the answers beforehand. "

"He clumsily spilled his milk while reaching for the cereal box. "

"My math homework had a mistake; I added the numbers incorrectly. "

"He was in trouble when the rain started."

"The old man's stumble caused him to fall and hurt his knee. "

"After a few stumbles on the icy sidewalk, I decided to walk on the grass. "