Regular verb: combine - combined - combined
Simple form | V-ing form |
I could combine you could combine she could combine we could combine you could combine they could combine | I could be combining you could be combining she could be combining we could be combining you could be combining they could be combining |
Perfect | V-ing perfect |
I could have combined you could have combined she could have combined we could have combined you could have combined they could have combined | I could have been combining you could have been combining she could have been combining we could have been combining you could have been combining they could have been combining |
Simple form | V-ing form |
I couldn't combine you couldn't combine she couldn't combine we couldn't combine you couldn't combine they couldn't combine | I couldn't be combining you couldn't be combining she couldn't be combining we couldn't be combining you couldn't be combining they couldn't be combining |
Perfect | V-ing perfect |
I couldn't have combined you couldn't have combined she couldn't have combined we couldn't have combined you couldn't have combined they couldn't have combined | I couldn't have been combining you couldn't have been combining she couldn't have been combining we couldn't have been combining you couldn't have been combining they couldn't have been combining |
Simple form | V-ing form |
could I combine? could you combine? could she combine? could we combine? could you combine? could they combine? | could I be combining? could you be combining? could she be combining? could we be combining? could you be combining? could they be combining? |
Perfect | V-ing perfect |
could I have combined? could you have combined? could she have combined? could we have combined? could you have combined? could they have combined? | could I have been combining? could you have been combining? could she have been combining? could we have been combining? could you have been combining? could they have been combining? |
Simple form | V-ing form |
couldn't I combine? couldn't you combine? couldn't she combine? couldn't we combine? couldn't you combine? couldn't they combine? | couldn't I be combining? couldn't you be combining? couldn't she be combining? couldn't we be combining? couldn't you be combining? couldn't they be combining? |
Perfect | V-ing perfect |
couldn't I have combined? couldn't you have combined? couldn't she have combined? couldn't we have combined? couldn't you have combined? couldn't they have combined? | couldn't I have been combining? couldn't you have been combining? couldn't she have been combining? couldn't we have been combining? couldn't you have been combining? couldn't they have been combining? |