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"The doctor used ultrasound to see the baby inside the mother's womb. "

"The protective helmet was essential for the construction worker. "

"It is difficult to provide for my family working on minimum wage."

"The student used a microscope to see the tiny cells in the plant leaf. "

"The students are developing their reading skills in their English class. "

"To explain a chapter of the Bible."

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

"The vegetables provided many essential nutrients for the growing children. "

"Simple Example: "Humans, dogs, and fish are all examples of vertebrates because they have a backbone." "

"The cell membrane controls what enters and leaves the cell. "

"A balanced diet provides the body with all the nutritives it needs to function properly. "

"The scientist studied the effects of different types of soil on plant growth. "