I can land you can land he can land we can land you can land they can land
V-ing form
I can be landing you can be landing he can be landing we can be landing you can be landing they can be landing
Perfect
I can have landed you can have landed he can have landed we can have landed you can have landed they can have landed
V-ing perfect
I can have been landing you can have been landing he can have been landing we can have been landing you can have been landing they can have been landing
Negation
Simple form
I can't land you can't land he can't land we can't land you can't land they can't land
V-ing form
I can't be landing you can't be landing he can't be landing we can't be landing you can't be landing they can't be landing
Perfect
I can't have landed you can't have landed he can't have landed we can't have landed you can't have landed they can't have landed
V-ing perfect
I can't have been landing you can't have been landing he can't have been landing we can't have been landing you can't have been landing they can't have been landing
Interrogative form
Simple form
can I land? can you land? can he land? can we land? can you land? can they land?
V-ing form
can I be landing? can you be landing? can he be landing? can we be landing? can you be landing? can they be landing?
Perfect
can I have landed? can you have landed? can he have landed? can we have landed? can you have landed? can they have landed?
V-ing perfect
can I have been landing? can you have been landing? can he have been landing? can we have been landing? can you have been landing? can they have been landing?
Interro-negative form
Simple form
can't I land? can't you land? can't he land? can't we land? can't you land? can't they land?
V-ing form
can't I be landing? can't you be landing? can't he be landing? can't we be landing? can't you be landing? can't they be landing?
Perfect
can't I have landed? can't you have landed? can't he have landed? can't we have landed? can't you have landed? can't they have landed?
V-ing perfect
can't I have been landing? can't you have been landing? can't he have been landing? can't we have been landing? can't you have been landing? can't they have been landing?