decay -> распадаться
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
decayed
did decay
----
did not decay
did'nt decay
I/we/you/theyhe/she/it
decaydecays
do decaydoes decay
----
do not decaydoes not decay
do'nt decaydoes'nt decay
I/he/she/it/we/you/they
will decay
 
----
will not decay
won't decay
Continous - процесс
I/he/she/itwe/you/they
was decayingwere decaying
----
was not decayingwere not decaying
Ihe/she/itwe/you/they
am decayingis decayingare decaying
----
am not decayingis not decayingare not decaying
 is'nt decayingare'nt decaying
I/he/she/it/we/you/they
will be decay
----
will not be decay
won't decay
Perfect - Завершенность
I/he/she/it/we/you/they
had decayed
----
had not decayed
had'nt decayed
I/we/you/theyhe/she/it
have decayedhas decayed
----
have not decayedhas not decayed
haven't decayedhasn't decayed
I/he/she/it/we/you/they
will be decayed
----
will not be decayed
won't be decayed
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been decaying
I/we/you/theyhe/she/it
have been decayinghas been decaying
I/he/she/it/we/you/they
will have been decaying
decay -> распадаться