Past tense
S + V2 + O (time signal : yesterday, … ago, last …)
P. Contionous >>S +Was/Were+ V-ing + O (time signal : when, while)
P. Perfect >> S +Had+ V3 + O (time signal : before, after, as should as, until)
P.P. Continous >> S +Had been+ V-ing + O (time signal : when)
P. Future >> S +Would+ V1 + O (time signal : if, unless, as long as)
P.F. Continous >> S + Would be+ V-ing + O (time signal 
n …, last …., at …. just)
P.F. Perfect >>S + Should/ Would +have +V3+ O (time signal :if, unless, as long as)
P.F.P. Continous >> S +Would +Have been+ V-ing + O (time signal : by …., for ….)
—
Present
P. Tense >>S + V1 + O(time signal : every …., always , seldom, even, never)
P. Continous >> S + tobe+ V-ing + O (time signal : now, today, rightnow, at that momment)
P. Perfect >>S +have/has+ V3 + O (time signal : since, for, already)
P.P.Continous >>S + have/has +been +Ving + O (time signal :all the morning)
—-
Future
F. tense >>S + will + V1 + O (time signal : tommorow, next….)
F. Continous >>S + will be+ Ving + O (time signal : at … , tommorow, on ….., next ….)
F. Perfect >>S + will have + V3 + O (time signal : by the end of ….. (this), by next ….)
F.P.Continous >>S + will have+ been+ Ving + O (time signal : by……, for……)
