sit -> сидеть
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
sat
did sit
----
did not sit
did'nt sit
I/we/you/theyhe/she/it
sitsits
do sitdoes sit
----
do not sitdoes not sit
do'nt sitdoes'nt sit
I/he/she/it/we/you/they
will sit
 
----
will not sit
won't sit
Continous - процесс
I/he/she/itwe/you/they
was sittingwere sitting
----
was not sittingwere not sitting
Ihe/she/itwe/you/they
am sittingis sittingare sitting
----
am not sittingis not sittingare not sitting
 is'nt sittingare'nt sitting
I/he/she/it/we/you/they
will be sit
----
will not be sit
won't sit
Perfect - Завершенность
I/he/she/it/we/you/they
had sat
----
had not sat
had'nt sat
I/we/you/theyhe/she/it
have sathas sat
----
have not sathas not sat
haven't sathasn't sat
I/he/she/it/we/you/they
will be sat
----
will not be sat
won't be sat
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been sitting
I/we/you/theyhe/she/it
have been sittinghas been sitting
I/he/she/it/we/you/they
will have been sitting
sit -> сидеть