I can mop you can mop he can mop we can mop you can mop they can mop
V-ing form
I can be mopping you can be mopping he can be mopping we can be mopping you can be mopping they can be mopping
Perfect
I can have mopped you can have mopped he can have mopped we can have mopped you can have mopped they can have mopped
V-ing perfect
I can have been mopping you can have been mopping he can have been mopping we can have been mopping you can have been mopping they can have been mopping
Negation
Simple form
I can't mop you can't mop he can't mop we can't mop you can't mop they can't mop
V-ing form
I can't be mopping you can't be mopping he can't be mopping we can't be mopping you can't be mopping they can't be mopping
Perfect
I can't have mopped you can't have mopped he can't have mopped we can't have mopped you can't have mopped they can't have mopped
V-ing perfect
I can't have been mopping you can't have been mopping he can't have been mopping we can't have been mopping you can't have been mopping they can't have been mopping
Interrogative form
Simple form
can I mop? can you mop? can he mop? can we mop? can you mop? can they mop?
V-ing form
can I be mopping? can you be mopping? can he be mopping? can we be mopping? can you be mopping? can they be mopping?
Perfect
can I have mopped? can you have mopped? can he have mopped? can we have mopped? can you have mopped? can they have mopped?
V-ing perfect
can I have been mopping? can you have been mopping? can he have been mopping? can we have been mopping? can you have been mopping? can they have been mopping?
Interro-negative form
Simple form
can't I mop? can't you mop? can't he mop? can't we mop? can't you mop? can't they mop?
V-ing form
can't I be mopping? can't you be mopping? can't he be mopping? can't we be mopping? can't you be mopping? can't they be mopping?
Perfect
can't I have mopped? can't you have mopped? can't he have mopped? can't we have mopped? can't you have mopped? can't they have mopped?
V-ing perfect
can't I have been mopping? can't you have been mopping? can't he have been mopping? can't we have been mopping? can't you have been mopping? can't they have been mopping?