undermined

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The constant noise from the construction site made it hard to concentrate on my homework. "

"The driver sped dangerously around the corner. "

"The underneath of the aircraft was painted blue."

"The student's sabotage of the rival team's project was successful, delaying their presentation and causing them to lose the competition. "

"The student studied hard with the purposes of getting good grades and graduating on time. "

"They bickered about dinner every evening."

"The storm was incredibly destructive, tearing down trees and damaging many homes. "

"He spent six years in the military."

"She struggled to play the difficult passages."

"The foundation of his institute has been wrought with difficulty."

"The little boy spent the whole afternoon building a magnificent sandcastle on the beach, complete with towers and a moat. "