begin -> начинать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
begun
did begin
----
did not begin
did'nt begin
I/we/you/theyhe/she/it
beginbegins
do begindoes begin
----
do not begindoes not begin
do'nt begindoes'nt begin
I/he/she/it/we/you/they
will begin
 
----
will not begin
won't begin
Continous - процесс
I/he/she/itwe/you/they
was beginningwere beginning
----
was not beginningwere not beginning
Ihe/she/itwe/you/they
am beginningis beginningare beginning
----
am not beginningis not beginningare not beginning
 is'nt beginningare'nt beginning
I/he/she/it/we/you/they
will be begin
----
will not be begin
won't begin
Perfect - Завершенность
I/he/she/it/we/you/they
had begun
----
had not begun
had'nt begun
I/we/you/theyhe/she/it
have begunhas begun
----
have not begunhas not begun
haven't begunhasn't begun
I/he/she/it/we/you/they
will be begun
----
will not be begun
won't be begun
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been beginning
I/we/you/theyhe/she/it
have been beginninghas been beginning
I/he/she/it/we/you/they
will have been beginning
begin -> начинать