I can lean you can lean she can lean we can lean you can lean they can lean
V-ing form
I can be leaning you can be leaning she can be leaning we can be leaning you can be leaning they can be leaning
Perfect
I can have leaned you can have leaned she can have leaned we can have leaned you can have leaned they can have leaned
V-ing perfect
I can have been leaning you can have been leaning she can have been leaning we can have been leaning you can have been leaning they can have been leaning
Negation
Simple form
I can't lean you can't lean she can't lean we can't lean you can't lean they can't lean
V-ing form
I can't be leaning you can't be leaning she can't be leaning we can't be leaning you can't be leaning they can't be leaning
Perfect
I can't have leaned you can't have leaned she can't have leaned we can't have leaned you can't have leaned they can't have leaned
V-ing perfect
I can't have been leaning you can't have been leaning she can't have been leaning we can't have been leaning you can't have been leaning they can't have been leaning
Interrogative form
Simple form
can I lean? can you lean? can she lean? can we lean? can you lean? can they lean?
V-ing form
can I be leaning? can you be leaning? can she be leaning? can we be leaning? can you be leaning? can they be leaning?
Perfect
can I have leaned? can you have leaned? can she have leaned? can we have leaned? can you have leaned? can they have leaned?
V-ing perfect
can I have been leaning? can you have been leaning? can she have been leaning? can we have been leaning? can you have been leaning? can they have been leaning?
Interro-negative form
Simple form
can't I lean? can't you lean? can't she lean? can't we lean? can't you lean? can't they lean?
V-ing form
can't I be leaning? can't you be leaning? can't she be leaning? can't we be leaning? can't you be leaning? can't they be leaning?
Perfect
can't I have leaned? can't you have leaned? can't she have leaned? can't we have leaned? can't you have leaned? can't they have leaned?
V-ing perfect
can't I have been leaning? can't you have been leaning? can't she have been leaning? can't we have been leaning? can't you have been leaning? can't they have been leaning?