Questions about example sentences with, and the definition and usage of "Roswell"

A: × From Roswell event to crop circle, countless witnesses told us that we are not the only intelligent human in the vast universe.
✓ From the Roswell event to the crop circle, countless witnesses have told us that we are not the only intelligent beings in the vast universe.

× When we observing animals in the Amazon forest, the aliens are observing us from the outside space at the same time too.
✓ When we are observing animals in the Amazon forest, the aliens are observing us from outer space at the same time too.

× Time flies.
✓ Time passes

× Our lives are too short to be remembered.
✓ and our lives are too short to be remembered.

× Don’t too stubborn and stupid, being a great man or a mortal are not important at all.
✓ Don’t be too stubborn and stupid, whether we are a great man or a simple mortal do not matter at all.

× Take a break for a cup of tea and a couple pages of book under the sun, avoid all distractions from outside of my tiny universe.
✓ Take a break for a cup of tea and read a couple pages of book under the sun, learn to avoid all distractions from outside our tiny universe.

"time flies" focuses more on the fact that times moves by very quickly.
Most of the edits are for better understanding and flow. 加油！