plain

"My grandmother taught me how to bake cookies when I was a child. "

"The teacher used figurative language to explain the complex concept, saying that the student's mind was a blank slate. "

"The development of this story has been slow."

"The students in the math class were very competitive; they all worked hard to get the best grades. "

"Before her presentation, she had butterflies, hoping she wouldn't forget anything. "

"The teacher explained the lesson thoroughly throughout the entire class period. "

"Construction is underway on the new bridge."

"The loud lamentation of the dog after its toy was taken away filled the house. "

"I distinctly remember my mother telling me to wear a jacket. "

"My grandfather helped me with my math homework. "

"I apologize, but "unattractive" is an adjective, not a noun. Here's a sentence using it correctly as an adjective, keeping your other guidelines in mind: "He felt unattractive after getting a bad haircut." "

"The teacher complicated the math problem by adding several extra steps. "