一般现在 1, am/is/are, 2, can/may/must 3 动词原形/三单
always, often, usually, sometimes, seldom, never, on Sunday, in the morning 等
一般过去时: last( week/month..), in 1996, ( two days ..)ago
现在进行时: now, listen, look, it's three o'clock...
过去进行时: at that time, nine o'clok last night, When I came home...
现在完成时: already, yet, never, ever, just, for, since..
一般将来时: tomorrow ( morning..), next (week/month), in 2050等
只给你写些如何判断这种事态的词/词组
上网查有详细的讲解,如果不明白可以 hi 我哟