undress -> раздевать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
undressed
did undress
----
did not undress
did'nt undress
I/we/you/theyhe/she/it
undressundresses
do undressdoes undress
----
do not undressdoes not undress
do'nt undressdoes'nt undress
I/he/she/it/we/you/they
will undress
 
----
will not undress
won't undress
Continous - процесс
I/he/she/itwe/you/they
was undressingwere undressing
----
was not undressingwere not undressing
Ihe/she/itwe/you/they
am undressingis undressingare undressing
----
am not undressingis not undressingare not undressing
 is'nt undressingare'nt undressing
I/he/she/it/we/you/they
will be undress
----
will not be undress
won't undress
Perfect - Завершенность
I/he/she/it/we/you/they
had undressed
----
had not undressed
had'nt undressed
I/we/you/theyhe/she/it
have undressedhas undressed
----
have not undressedhas not undressed
haven't undressedhasn't undressed
I/he/she/it/we/you/they
will be undressed
----
will not be undressed
won't be undressed
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been undressing
I/we/you/theyhe/she/it
have been undressinghas been undressing
I/he/she/it/we/you/they
will have been undressing
undress -> раздевать