I can bumble you can bumble she can bumble we can bumble you can bumble they can bumble
V-ing form
I can be bumbling you can be bumbling she can be bumbling we can be bumbling you can be bumbling they can be bumbling
Perfect
I can have bumbled you can have bumbled she can have bumbled we can have bumbled you can have bumbled they can have bumbled
V-ing perfect
I can have been bumbling you can have been bumbling she can have been bumbling we can have been bumbling you can have been bumbling they can have been bumbling
Negation
Simple form
I can't bumble you can't bumble she can't bumble we can't bumble you can't bumble they can't bumble
V-ing form
I can't be bumbling you can't be bumbling she can't be bumbling we can't be bumbling you can't be bumbling they can't be bumbling
Perfect
I can't have bumbled you can't have bumbled she can't have bumbled we can't have bumbled you can't have bumbled they can't have bumbled
V-ing perfect
I can't have been bumbling you can't have been bumbling she can't have been bumbling we can't have been bumbling you can't have been bumbling they can't have been bumbling
Interrogative form
Simple form
can I bumble? can you bumble? can she bumble? can we bumble? can you bumble? can they bumble?
V-ing form
can I be bumbling? can you be bumbling? can she be bumbling? can we be bumbling? can you be bumbling? can they be bumbling?
Perfect
can I have bumbled? can you have bumbled? can she have bumbled? can we have bumbled? can you have bumbled? can they have bumbled?
V-ing perfect
can I have been bumbling? can you have been bumbling? can she have been bumbling? can we have been bumbling? can you have been bumbling? can they have been bumbling?
Interro-negative form
Simple form
can't I bumble? can't you bumble? can't she bumble? can't we bumble? can't you bumble? can't they bumble?
V-ing form
can't I be bumbling? can't you be bumbling? can't she be bumbling? can't we be bumbling? can't you be bumbling? can't they be bumbling?
Perfect
can't I have bumbled? can't you have bumbled? can't she have bumbled? can't we have bumbled? can't you have bumbled? can't they have bumbled?
V-ing perfect
can't I have been bumbling? can't you have been bumbling? can't she have been bumbling? can't we have been bumbling? can't you have been bumbling? can't they have been bumbling?