{Sentence 1: (Using "mark" as a verb)}
She will mark the answer on the paper. (Here, "mark" is used as a verb, meaning to indicate or put a symbol on something.)
{Sentence 2: (Using "mark" as a noun)}
There was a red mark on the wall. (Here, "mark" is used as a noun, meaning a visible sign or indication.)
% Final Answer
Final Answer:
1. She will mark the answer on the paper. (verb)
2. There was a red mark on the wall. (noun)