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