1. Using verb tenses reviewed…
The Verb Tenses
Using verb tenses reviewed…

2. The Simple Tenses Present Simple
He lives in Vietnam too and works as an engineer.
She travels a lot for her job.
For facts, universal truths, and repeated actions
Facts: He lives in Vietnam, He works as an engineer
Repeated actions: She travels again and again
Present Progressive
Katie is living in Vietnam at the moment.
For events happening right now or sometimes used for future with or without ‘going to’
Future Simple
Her next trip, in a few weeks, will be to Brazil.
For events in the future
Future Progressive
She'll be working for them next year as well.
For events transpiring for a period of time in the future
Past Simple
Her mother sat down beside him.
For completed actions in the past
Past Progressive
Katie’s father was sitting in the park when her mother sat down beside him.
For actions in the past transpiring for a period of time. Also, interrupted actions in the past. He was sitting for a period of time when she sat down and interrupted whatever he was doing.

3. The Perfect Tenses Present Perfect Simple
Katie has studied many languages.
At some vague time in her life she
studied, she may still study. It
is unknown.
Present Perfect Progressive
She has been studying Vietnamese for months.
She began studying in the past and continued to study for a period of time. She is still studying in the present.
Future Perfect Simple
She'll have traveled over 120,000 miles by
December.
As of some point in the future we can state that the action will have occurred at some vague point in time in the past. In other words, as of next December, the action of travel will have been completed.
Future Perfect Progressive
She'll have been sitting for over 18 hours by the time she arrives!
As of some point in the future we can say that she began to sit in the past sits for a period of time (18 hours) and will be sitting in the future.
Past Perfect Simple
Her boss telephoned to let her know that her company had decided to merge with a company in Australia.  
Used for actions in the past which happen before other past actions in simple past. In the example to the left, the companies had already decided to merge before he telephoned to tell her.
Past Perfect Progressive
The two companies had been negotiating for the past month. (when they reached an agreement)
Used for ongoing actions that transpired in the far past which were interrupted. They had been negotiating for some time before the decision was made.