These walls creaked and groaned because of how old they were
The imperative mood is used to give a command or make a request!
Answer:
Scientists hope to make more serious accusations and interpret more knowledge onto the planet. There are still many things that scientists haven't discovered such as how the planet changes and adapts over time.
Explanation:
I have no idea how many sentences you need
"I am still a beast at bay," he said, in a low, hoarse voice. "Get ready, General Zaroff."
An affix attached at the end of a word is called a suffix! Hope it helps but remeber the end of a word is suffix and the beginning is prefix