auxiliary word(used after a verb or an adjective to indicate the completion of an action or a change)
This group has been commended.
People crowded the railway station.
Have you cleaned your teeth?
The water level has dropped.
auxiliary word(used at the end of a sentence or a pause in the middle of a sentence to indicate a change or a new situation)
In spring, peach blossoms are in full bloom.
He will also be very happy if he hears this news.
You'd better leave till the rain stops.