| A. Use present simple for routines, habits, or things that are always true.
- He takes the subway. (every day)
B. Use present progressive (is/are -ing) for a temporary routine or situation.
- He is taking the subway. (now)
C. Use present perfect (have/has -ed) for a situation where things that happened in the past have a result in the present.
- Present perfect often goes with just, yet, for, since, ever, never, first time, second time, this week.
- He has just cut himself. (We can see the direct immediate result of this action — the blood.)
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