What you waste today is the tomorrow that people who died yesterday expect. What you hate now is the future you can't go back to.
Basic usage:
The simple present tense indicates the present state, frequent or habitual actions, the subject's personality and ability, etc.
Adverbials of time: always, naturally, oft, some times, every week (day, year, month …), once a week (day, year, month …), Sunday (Monday …).
Extended data:
Matters needing attention in grammar:
the present perfect tense
1, concept: the influence or result of an action that happened or has been completed in the past on the present, or the action or state that started from the past and continues to the present.
2. Adverbials of time: not yet, ready, just now, never, once, up to now, since+time point, duration+time period, recently, recently, in the past few years, etc.