warn -> предупреждать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
warned
did warn
----
did not warn
did'nt warn
I/we/you/theyhe/she/it
warnwarns
do warndoes warn
----
do not warndoes not warn
do'nt warndoes'nt warn
I/he/she/it/we/you/they
will warn
 
----
will not warn
won't warn
Continous - процесс
I/he/she/itwe/you/they
was warningwere warning
----
was not warningwere not warning
Ihe/she/itwe/you/they
am warningis warningare warning
----
am not warningis not warningare not warning
 is'nt warningare'nt warning
I/he/she/it/we/you/they
will be warn
----
will not be warn
won't warn
Perfect - Завершенность
I/he/she/it/we/you/they
had warned
----
had not warned
had'nt warned
I/we/you/theyhe/she/it
have warnedhas warned
----
have not warnedhas not warned
haven't warnedhasn't warned
I/he/she/it/we/you/they
will be warned
----
will not be warned
won't be warned
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been warning
I/we/you/theyhe/she/it
have been warninghas been warning
I/he/she/it/we/you/they
will have been warning
warn -> предупреждать