incurred

"You must do your homework before you can watch television."

"Wear a hat to protect your skin from harmful sunlight."

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

"The new accounting software proved to be an onerous task, requiring countless hours of training and practice to master. "

"My sister is very helpful, especially when it comes to organizing things. "

"Teaching oneself to swim can be dangerous."

"The heavy rain was unexpected; we had planned a picnic in the park. "

""Many students have problems understanding fractions." "

"He completed the assignment on time."

"The students are subject to strict rules about late arrivals. "

"My mother expressed her displeasure with my poor grades. "

"The inconvenient in the schedule was that the meeting room was double-booked, forcing us to find another space. "