example

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

"Only a small fraction of the students passed the difficult math test. "

"The student council chose a representative to speak at the school assembly. "

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

"The teacher illustrated the difficult math problem by showing each step on the board. "

"Her dedication to studying, even when faced with challenges, exemplified her strong work ethic. "

"The application of this cream should reduce the swelling."

"The court case set a precedent for future cases involving similar environmental damage. "

"a successful use of medicine;  a successful experiment;  a successful enterprise"

"The teacher's example illustrated how to solve the math problem. "

"The presentation about the new school rules was very clear and easy to understand. "

"The teacher praised Sarah's good behaviour in class. "