I could presume you could presume she could presume we could presume you could presume they could presume
V-ing form
I could be presuming you could be presuming she could be presuming we could be presuming you could be presuming they could be presuming
Perfect
I could have presumed you could have presumed she could have presumed we could have presumed you could have presumed they could have presumed
V-ing perfect
I could have been presuming you could have been presuming she could have been presuming we could have been presuming you could have been presuming they could have been presuming
Negation
Simple form
I couldn't presume you couldn't presume she couldn't presume we couldn't presume you couldn't presume they couldn't presume
V-ing form
I couldn't be presuming you couldn't be presuming she couldn't be presuming we couldn't be presuming you couldn't be presuming they couldn't be presuming
Perfect
I couldn't have presumed you couldn't have presumed she couldn't have presumed we couldn't have presumed you couldn't have presumed they couldn't have presumed
V-ing perfect
I couldn't have been presuming you couldn't have been presuming she couldn't have been presuming we couldn't have been presuming you couldn't have been presuming they couldn't have been presuming
Interrogative form
Simple form
could I presume? could you presume? could she presume? could we presume? could you presume? could they presume?
V-ing form
could I be presuming? could you be presuming? could she be presuming? could we be presuming? could you be presuming? could they be presuming?
Perfect
could I have presumed? could you have presumed? could she have presumed? could we have presumed? could you have presumed? could they have presumed?
V-ing perfect
could I have been presuming? could you have been presuming? could she have been presuming? could we have been presuming? could you have been presuming? could they have been presuming?
Interro-negative form
Simple form
couldn't I presume? couldn't you presume? couldn't she presume? couldn't we presume? couldn't you presume? couldn't they presume?
V-ing form
couldn't I be presuming? couldn't you be presuming? couldn't she be presuming? couldn't we be presuming? couldn't you be presuming? couldn't they be presuming?
Perfect
couldn't I have presumed? couldn't you have presumed? couldn't she have presumed? couldn't we have presumed? couldn't you have presumed? couldn't they have presumed?
V-ing perfect
couldn't I have been presuming? couldn't you have been presuming? couldn't she have been presuming? couldn't we have been presuming? couldn't you have been presuming? couldn't they have been presuming?