I could catalyse you could catalyse he could catalyse we could catalyse you could catalyse they could catalyse
Forme en V-ing
I could be catalysing you could be catalysing he could be catalysing we could be catalysing you could be catalysing they could be catalysing
Perfect
I could have catalysed you could have catalysed he could have catalysed we could have catalysed you could have catalysed they could have catalysed
Perfect en V-ing
I could have been catalysing you could have been catalysing he could have been catalysing we could have been catalysing you could have been catalysing they could have been catalysing
Négation
Forme simple
I could not catalyse you could not catalyse he could not catalyse we could not catalyse you could not catalyse they could not catalyse
Forme en V-ing
I could not be catalysing you could not be catalysing he could not be catalysing we could not be catalysing you could not be catalysing they could not be catalysing
Perfect
I could not have catalysed you could not have catalysed he could not have catalysed we could not have catalysed you could not have catalysed they could not have catalysed
Perfect en V-ing
I could not have been catalysing you could not have been catalysing he could not have been catalysing we could not have been catalysing you could not have been catalysing they could not have been catalysing
Forme interrogative
Forme simple
could I catalyse? could you catalyse? could he catalyse? could we catalyse? could you catalyse? could they catalyse?
Forme en V-ing
could I be catalysing? could you be catalysing? could he be catalysing? could we be catalysing? could you be catalysing? could they be catalysing?
Perfect
could I have catalysed? could you have catalysed? could he have catalysed? could we have catalysed? could you have catalysed? could they have catalysed?
Perfect en V-ing
could I have been catalysing? could you have been catalysing? could he have been catalysing? could we have been catalysing? could you have been catalysing? could they have been catalysing?
Forme interro-négative
Forme simple
could I not catalyse? could you not catalyse? could he not catalyse? could we not catalyse? could you not catalyse? could they not catalyse?
Forme en V-ing
could I not be catalysing? could you not be catalysing? could he not be catalysing? could we not be catalysing? could you not be catalysing? could they not be catalysing?
Perfect
could I not have catalysed? could you not have catalysed? could he not have catalysed? could we not have catalysed? could you not have catalysed? could they not have catalysed?
Perfect en V-ing
could I not have been catalysing? could you not have been catalysing? could he not have been catalysing? could we not have been catalysing? could you not have been catalysing? could they not have been catalysing?