Generate a sentence that answers this question: "A person's shadow is smallest at what time?".

Answer: as a source of light moves directly overhead of an object , the size of the shadow of that object will decrease

Generate a sentence that answers this question: "Why would something appear blue?".

Answer: if an object is blue then that object reflects only blue light

Generate a sentence that answers this question: "cooking food requires adding what?".

Answer:
cooking food requires adding heat energy