Regular verb: sum - summed - summed
Simple form | V-ing form |
I can sum you can sum she can sum we can sum you can sum they can sum | I can be summing you can be summing she can be summing we can be summing you can be summing they can be summing |
Perfect | V-ing perfect |
I can have summed you can have summed she can have summed we can have summed you can have summed they can have summed | I can have been summing you can have been summing she can have been summing we can have been summing you can have been summing they can have been summing |
Simple form | V-ing form |
I can't sum you can't sum she can't sum we can't sum you can't sum they can't sum | I can't be summing you can't be summing she can't be summing we can't be summing you can't be summing they can't be summing |
Perfect | V-ing perfect |
I can't have summed you can't have summed she can't have summed we can't have summed you can't have summed they can't have summed | I can't have been summing you can't have been summing she can't have been summing we can't have been summing you can't have been summing they can't have been summing |
Simple form | V-ing form |
can I sum? can you sum? can she sum? can we sum? can you sum? can they sum? | can I be summing? can you be summing? can she be summing? can we be summing? can you be summing? can they be summing? |
Perfect | V-ing perfect |
can I have summed? can you have summed? can she have summed? can we have summed? can you have summed? can they have summed? | can I have been summing? can you have been summing? can she have been summing? can we have been summing? can you have been summing? can they have been summing? |
Simple form | V-ing form |
can't I sum? can't you sum? can't she sum? can't we sum? can't you sum? can't they sum? | can't I be summing? can't you be summing? can't she be summing? can't we be summing? can't you be summing? can't they be summing? |
Perfect | V-ing perfect |
can't I have summed? can't you have summed? can't she have summed? can't we have summed? can't you have summed? can't they have summed? | can't I have been summing? can't you have been summing? can't she have been summing? can't we have been summing? can't you have been summing? can't they have been summing? |