How would ancient Israelites have understood the 1st person plural forms (us/our) in Genesis 1, 3, and 5?

How would ancient Israelites have understood the 1st person plural forms (us/our) in Genesis 1, 3, and 5?Sources to choose from -Genesis 37:18-36; 39:1Genesis 1-3; 6-9; 12; 15; 17, 22, 28