Indicates a specific moment...
It indicates something that happened next...
It makes reference to the moment previous to an action.
Inmediately at or shortly after the time...
Indicates the beginning of the period of time.
Marks the end point of the period of time.
The action happens after another action...
Means "during the period of time"...
ONCE
AS SOON AS
BEFORE
WHEN
AFTER
SINCE
UNTIL
WHILE