constraints

"The condition for getting a raise at work is meeting your quarterly targets. "

"After the field trip, only a few students remained in the classroom. "

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

"The school's new restriction on cell phone use during class improved student focus. "

"The smell of freshly baked cookies was irresistible; everyone in the kitchen rushed to the counter. "

"During the basketball game, I had a sudden compulsion to have a smoke."

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"History shows that when governments fear the truth and increase repression, their days are limited."

"The heavy backpack constrains my movement, making it hard to walk quickly. "

"What is your question?"

"The mechanic maintains the engine while I fetch him the tools he needs. "

"The software update focused on optimization of battery life, so phones could last longer on a single charge. "