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Period: to
Simple Present: I play football every Sunday
We use the simple Present to talk about events that happen regularly, or to talk about habits. -
Simple Past: I was at the hospital
We use the simple past to talk about something we did in the past and it's finished -
Period: to
Present Perfect: I have just arrived from England
We use the Present Perfect to talk about something that happened in the past and has just recently finished or we don't know when exactly it happened. -
Present Continuous: Right now, I am doing my homework
We use the present continuous to talk about what we are doing NOW.