........ is a method that we use in English to refer to time - past, present and future.
..........are used to show permanent characteristics of people and events or what happens regularly, habitually or in a single completed action.
Verbs in ............... always express "actions" that are in progress during the time framework indicated: present, past, future, or any of the perfect timeframes.
................are used when an action or situation in the present is linked to a moment in the past. It is often used to show things that have happened up to now but aren't finished yet or to emphasize that something happened but is not true anymore.
...................used to denote an ongoing action either starting and ending in the past or starting in the past and continuing into the present.
A tense expressing an action that is currently going on or habitually performed, or a state that currently or generally exists.
A tense expressing an action that has happened or a state that previously existed.
A tense expressing an action that has not yet happened or a state that does not yet exist.