relativity

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

"Why do my relatives always talk about sex?"

"The engineers designed a new water filtration system for the school. "

"My uncle is a physicist who works at a university. "

"The difficulty of the math problem made it hard for many students to solve it. "

"My baking skills have developed significantly since I started taking the online course. "

"The architect was designing a new school building. "

"A spent upper stage is a derelict satellite."

"The teacher patiently explained the math problem, and the students were able to understand the steps involved. "

"Most impartial observers agreed that Sampras had not served well."

"We need some sort of principles to reason from."

"We challenged the boys next door to a game of football."