teach -> обучать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
taught
did teach
----
did not teach
did'nt teach
I/we/you/theyhe/she/it
teachteaches
do teachdoes teach
----
do not teachdoes not teach
do'nt teachdoes'nt teach
I/he/she/it/we/you/they
will teach
 
----
will not teach
won't teach
Continous - процесс
I/he/she/itwe/you/they
was teachingwere teaching
----
was not teachingwere not teaching
Ihe/she/itwe/you/they
am teachingis teachingare teaching
----
am not teachingis not teachingare not teaching
 is'nt teachingare'nt teaching
I/he/she/it/we/you/they
will be teach
----
will not be teach
won't teach
Perfect - Завершенность
I/he/she/it/we/you/they
had taught
----
had not taught
had'nt taught
I/we/you/theyhe/she/it
have taughthas taught
----
have not taughthas not taught
haven't taughthasn't taught
I/he/she/it/we/you/they
will be taught
----
will not be taught
won't be taught
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been teaching
I/we/you/theyhe/she/it
have been teachinghas been teaching
I/he/she/it/we/you/they
will have been teaching
teach -> обучать