Now is really not 'now'. What we see as 'now' is in fact in the past.
This is because duration happens from the current state to the 'now' we understand. This duration is our nervous system sensing conditions and sending those signals to our brain which then creates an impression of 'now'.
Technically, in this way, we all live in the past slightly but it is still the past. If the 'now' changes before we can process it, we get confused.
Mind altering drugs, alcohol and brain defects can all lead to confused assessment of 'now'.

Time is a series of static states which change faster than we can detect (like snapshots from a camera). We see time as a fluid motion of progress most of the time.
Since our brains can associate slight changes in those static states we can predict the future in most cases. However, the more distant the prediction from the current detected state, the more likely our predictions will have errors.
When conditions change faster than we can predict we get surprised.

You see a pencil rolling off a table. You predict its future of it falling onto the floor. If a ball hits the pencil as it is falling, it doesn't hit the floor as predicted and we are surprised by that. The predicted series of state changes does not align with the reality. But, if you predict the ball hitting the pencil as it is falling, your prediction is valid and you have predicted the future.

The Past is processed by memory.
The Present is processed by stimuli.
The Future is processed by prediction.

Since the past is processed by memory and memory is more than a record of events, the past is subject to beholder and can be incorrect to actual events.

Some of the predictions of the future involve the memory of the past.

You once saw a pencil roll across a table and fall on the floor. You expect it to do the same thing you witnessed in the past.
When the ball intercepts the predicted outcome, present conditions have changed the future prediction.

The Past, Present and Future are extremely significant in the fact they constitute what we call "Life" or "Living".

Forever (Always) is a construct of our minds which bases in our ability to recognize the future and the past.
Never is also a construct of our minds based on our ability to recognize the past and predict the future.
'Forever' is optimistic and 'Never' is pessimistic.
'Usually' and 'Likely' acknowledges unpredictable events happen.

in my opinion we have no idea about questions such as infinity when we really have no idea what is up there...and we don't.
Hell, we don't even know what's in our oceans.

Forever (Always) is a construct of our minds which bases in our ability to recognize the future and the past.