Regular verb: perform - performed - performed
Simple form | V-ing form |
I could perform you could perform he could perform we could perform you could perform they could perform | I could be performing you could be performing he could be performing we could be performing you could be performing they could be performing |
Perfect | V-ing perfect |
I could have performed you could have performed he could have performed we could have performed you could have performed they could have performed | I could have been performing you could have been performing he could have been performing we could have been performing you could have been performing they could have been performing |
Simple form | V-ing form |
I couldn't perform you couldn't perform he couldn't perform we couldn't perform you couldn't perform they couldn't perform | I couldn't be performing you couldn't be performing he couldn't be performing we couldn't be performing you couldn't be performing they couldn't be performing |
Perfect | V-ing perfect |
I couldn't have performed you couldn't have performed he couldn't have performed we couldn't have performed you couldn't have performed they couldn't have performed | I couldn't have been performing you couldn't have been performing he couldn't have been performing we couldn't have been performing you couldn't have been performing they couldn't have been performing |
Simple form | V-ing form |
could I perform? could you perform? could he perform? could we perform? could you perform? could they perform? | could I be performing? could you be performing? could he be performing? could we be performing? could you be performing? could they be performing? |
Perfect | V-ing perfect |
could I have performed? could you have performed? could he have performed? could we have performed? could you have performed? could they have performed? | could I have been performing? could you have been performing? could he have been performing? could we have been performing? could you have been performing? could they have been performing? |
Simple form | V-ing form |
couldn't I perform? couldn't you perform? couldn't he perform? couldn't we perform? couldn't you perform? couldn't they perform? | couldn't I be performing? couldn't you be performing? couldn't he be performing? couldn't we be performing? couldn't you be performing? couldn't they be performing? |
Perfect | V-ing perfect |
couldn't I have performed? couldn't you have performed? couldn't he have performed? couldn't we have performed? couldn't you have performed? couldn't they have performed? | couldn't I have been performing? couldn't you have been performing? couldn't he have been performing? couldn't we have been performing? couldn't you have been performing? couldn't they have been performing? |