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It's used to talk about something that started and finished at a definite time in the past.
Example: I played soccer (S+ V in past+ C) -
It's used to talk about conditions or actions happening right now or habitual actions and occurrences.
Example: I play soccer (S+ V in present + C) -
It refers to a time later than now, and expresses facts or certainty.
Example: I will play soccer (S+ Will + V + C)
