Conjugação do verbo inglês
COULD CATALYZE

Verbo regular: catalyze - catalyzed - catalyzed

Afirmação

Forma simple	Forma com V-ing
I could catalyze you could catalyze he could catalyze we could catalyze you could catalyze they could catalyze	I could be catalyzing you could be catalyzing he could be catalyzing we could be catalyzing you could be catalyzing they could be catalyzing
Perfeito	Perfeito com V-ing
I could have catalyzed you could have catalyzed he could have catalyzed we could have catalyzed you could have catalyzed they could have catalyzed	I could have been catalyzing you could have been catalyzing he could have been catalyzing we could have been catalyzing you could have been catalyzing they could have been catalyzing

Negação

Forma simple	Forma com V-ing
I couldn't catalyze you couldn't catalyze he couldn't catalyze we couldn't catalyze you couldn't catalyze they couldn't catalyze	I couldn't be catalyzing you couldn't be catalyzing he couldn't be catalyzing we couldn't be catalyzing you couldn't be catalyzing they couldn't be catalyzing
Perfeito	Perfeito com V-ing
I couldn't have catalyzed you couldn't have catalyzed he couldn't have catalyzed we couldn't have catalyzed you couldn't have catalyzed they couldn't have catalyzed	I couldn't have been catalyzing you couldn't have been catalyzing he couldn't have been catalyzing we couldn't have been catalyzing you couldn't have been catalyzing they couldn't have been catalyzing

Forma interrogativa

Forma simple	Forma com V-ing
could I catalyze? could you catalyze? could he catalyze? could we catalyze? could you catalyze? could they catalyze?	could I be catalyzing? could you be catalyzing? could he be catalyzing? could we be catalyzing? could you be catalyzing? could they be catalyzing?
Perfeito	Perfeito com V-ing
could I have catalyzed? could you have catalyzed? could he have catalyzed? could we have catalyzed? could you have catalyzed? could they have catalyzed?	could I have been catalyzing? could you have been catalyzing? could he have been catalyzing? could we have been catalyzing? could you have been catalyzing? could they have been catalyzing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I catalyze? couldn't you catalyze? couldn't he catalyze? couldn't we catalyze? couldn't you catalyze? couldn't they catalyze?	couldn't I be catalyzing? couldn't you be catalyzing? couldn't he be catalyzing? couldn't we be catalyzing? couldn't you be catalyzing? couldn't they be catalyzing?
Perfeito	Perfeito com V-ing
couldn't I have catalyzed? couldn't you have catalyzed? couldn't he have catalyzed? couldn't we have catalyzed? couldn't you have catalyzed? couldn't they have catalyzed?	couldn't I have been catalyzing? couldn't you have been catalyzing? couldn't he have been catalyzing? couldn't we have been catalyzing? couldn't you have been catalyzing? couldn't they have been catalyzing?