sell -> продавать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
sold
did sell
----
did not sell
did'nt sell
I/we/you/theyhe/she/it
sellsells
do selldoes sell
----
do not selldoes not sell
do'nt selldoes'nt sell
I/he/she/it/we/you/they
will sell
 
----
will not sell
won't sell
Continous - процесс
I/he/she/itwe/you/they
was sellingwere selling
----
was not sellingwere not selling
Ihe/she/itwe/you/they
am sellingis sellingare selling
----
am not sellingis not sellingare not selling
 is'nt sellingare'nt selling
I/he/she/it/we/you/they
will be sell
----
will not be sell
won't sell
Perfect - Завершенность
I/he/she/it/we/you/they
had sold
----
had not sold
had'nt sold
I/we/you/theyhe/she/it
have soldhas sold
----
have not soldhas not sold
haven't soldhasn't sold
I/he/she/it/we/you/they
will be sold
----
will not be sold
won't be sold
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been selling
I/we/you/theyhe/she/it
have been sellinghas been selling
I/he/she/it/we/you/they
will have been selling
sell -> продавать