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