过去时态标识：the other day(前几天），last night,in 2000,yesterday morning,used to do(过去常做，现在不做），but now....,and作连接词时
e.g.My sister stayed in Beijing for three months last year.
过去进行时-was\were doing
过去完成时-had done
过去某时间或某动作前已经完成的动作，即“过去的过去”
e.g.The old man had fallen down before I crashed him.
已有did,再填had,had在did发生前
有明确的时间标志：by\before＋过去时间
e.g.SunWukong had been buried by1000\before 1000.
无明确时间标志：已有did,且had done在did发生之前已发生过
e.g.The old man had fallen down before I crashed him.
过去完成进行时-had been doing（未学习）
现在(now)
一般现在时-do\does\am\are\is
使用情况：在任何时间条件下都可成立，不受时间限制
e.g.The train takes off at 18:20.
The campus is large and I nearly got lost just now.
现在进行时-am\is\are doing
现在完成时-has\have done
主动：have\has (not) done
被动：have\has (not) been done
常见时标：since自从，因为、lately\recently\in recent years最近、up to now\by now到目前为止、over\in\during the past\last years在过去的几年里、It is the first time that I have done sth.第几次做某事
与延续性动词或形容词化动词搭配使用，瞬间动词须变为延续性形式
现在完成进行时-has\have been doing
e.g.She has been crying for a long time.
未来(future)
一般将来时-will do\be
will do（临时决定）
be going to do(立即发生)
be to do（命中注定）
be doing（非延续性动词＋ing)
来去（come\go);开关(open\close);到走(arrive\leave)
e.g.She is about to begin her lesson.（常见句式：be about to do...when...突然）
You are to be my friend.
将来进行时-will be doing
进行态常与always,all the time等时状连用，表强烈喜悦或抱怨
e.g.This time next year,we will be lying on the beach somewhere in Brazil.
将来完成时-will have done
站在现在的角度看未来，并且事件将在将来的某一时间点（或之前）已完成（已截止）
主动：will (not) have done
被动：will (not) have been done
辨析：一般将来时 in 2050
将来完成时 by\before the 2050
（PS： someday未来的某一天）
