The day's work began.
Present Continuous: The day's work is beginning now.
Future Simple: The day's work will begin soon.
Past Simple:The day's work began an hour ago.
Past Continuous: The day's work was beginning when he came.
Present Perfect: The day's work has just begun.
She ran downstairs to the kitchen
Present Continuous: She is running downstairs to the kitchen
Future Simple She will run downstairs to the kitchen
Past Simple She ran downstairs to the kitchen
Past Continuous She was running downstairs to the kitchen when she fell.
Present Perfect She has already run downstairs to the kitchen