I could obligate you could obligate he could obligate we could obligate you could obligate they could obligate
V-ing form
I could be obligating you could be obligating he could be obligating we could be obligating you could be obligating they could be obligating
Perfect
I could have obligated you could have obligated he could have obligated we could have obligated you could have obligated they could have obligated
V-ing perfect
I could have been obligating you could have been obligating he could have been obligating we could have been obligating you could have been obligating they could have been obligating
Negation
Simple form
I couldn't obligate you couldn't obligate he couldn't obligate we couldn't obligate you couldn't obligate they couldn't obligate
V-ing form
I couldn't be obligating you couldn't be obligating he couldn't be obligating we couldn't be obligating you couldn't be obligating they couldn't be obligating
Perfect
I couldn't have obligated you couldn't have obligated he couldn't have obligated we couldn't have obligated you couldn't have obligated they couldn't have obligated
V-ing perfect
I couldn't have been obligating you couldn't have been obligating he couldn't have been obligating we couldn't have been obligating you couldn't have been obligating they couldn't have been obligating
Interrogative form
Simple form
could I obligate? could you obligate? could he obligate? could we obligate? could you obligate? could they obligate?
V-ing form
could I be obligating? could you be obligating? could he be obligating? could we be obligating? could you be obligating? could they be obligating?
Perfect
could I have obligated? could you have obligated? could he have obligated? could we have obligated? could you have obligated? could they have obligated?
V-ing perfect
could I have been obligating? could you have been obligating? could he have been obligating? could we have been obligating? could you have been obligating? could they have been obligating?
Interro-negative form
Simple form
couldn't I obligate? couldn't you obligate? couldn't he obligate? couldn't we obligate? couldn't you obligate? couldn't they obligate?
V-ing form
couldn't I be obligating? couldn't you be obligating? couldn't he be obligating? couldn't we be obligating? couldn't you be obligating? couldn't they be obligating?
Perfect
couldn't I have obligated? couldn't you have obligated? couldn't he have obligated? couldn't we have obligated? couldn't you have obligated? couldn't they have obligated?
V-ing perfect
couldn't I have been obligating? couldn't you have been obligating? couldn't he have been obligating? couldn't we have been obligating? couldn't you have been obligating? couldn't they have been obligating?