Regular verb: stack - stacked - stacked
Simple form | V-ing form |
I can stack you can stack she can stack we can stack you can stack they can stack | I can be stacking you can be stacking she can be stacking we can be stacking you can be stacking they can be stacking |
Perfect | V-ing perfect |
I can have stacked you can have stacked she can have stacked we can have stacked you can have stacked they can have stacked | I can have been stacking you can have been stacking she can have been stacking we can have been stacking you can have been stacking they can have been stacking |
Simple form | V-ing form |
I can't stack you can't stack she can't stack we can't stack you can't stack they can't stack | I can't be stacking you can't be stacking she can't be stacking we can't be stacking you can't be stacking they can't be stacking |
Perfect | V-ing perfect |
I can't have stacked you can't have stacked she can't have stacked we can't have stacked you can't have stacked they can't have stacked | I can't have been stacking you can't have been stacking she can't have been stacking we can't have been stacking you can't have been stacking they can't have been stacking |
Simple form | V-ing form |
can I stack? can you stack? can she stack? can we stack? can you stack? can they stack? | can I be stacking? can you be stacking? can she be stacking? can we be stacking? can you be stacking? can they be stacking? |
Perfect | V-ing perfect |
can I have stacked? can you have stacked? can she have stacked? can we have stacked? can you have stacked? can they have stacked? | can I have been stacking? can you have been stacking? can she have been stacking? can we have been stacking? can you have been stacking? can they have been stacking? |
Simple form | V-ing form |
can't I stack? can't you stack? can't she stack? can't we stack? can't you stack? can't they stack? | can't I be stacking? can't you be stacking? can't she be stacking? can't we be stacking? can't you be stacking? can't they be stacking? |
Perfect | V-ing perfect |
can't I have stacked? can't you have stacked? can't she have stacked? can't we have stacked? can't you have stacked? can't they have stacked? | can't I have been stacking? can't you have been stacking? can't she have been stacking? can't we have been stacking? can't you have been stacking? can't they have been stacking? |