Question

She (not hear) any noise an hour ago

Answer 1

Answer:

she did not hear any noise and hour ago.

Answer 2

To find: She (not hear) any noise an hour ago. Use the correct form of verb.
Answer: She didn't hear any noise an hour ago.
Explanation:
• Here is an Infinitive. When we proceed the infinitive of a verb with do, does, don't, doesn't etc, they are those words that show whether the tense is past or present. The verb that follows is alway in the infinitive form.
• Didn't refers to past while don't and doesn't refers to present.
Hence, the sentence is in past tense(negative form)
#SPJ2