explain

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

"The child's disruptive behavior in class was a concern for the teacher. "

"The customs officer checked the ship's manifest to verify the cargo being imported. "

"My teacher explained the new math concept, and I understood it perfectly. "

"Electrical diagrams show device interconnections."

"The teacher's instructions were intelligible, and the students easily followed along. "

"Everyone in the class needs to bring their textbook to the first lecture. "

"To explain a chapter of the Bible."

"She was smoothing the wrinkles out of her dress before the meeting. "

"The carpenter built a new wooden bookshelf for my bedroom. "

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

"The obscurity of the room made it hard to see the small, hidden objects on the desk. "