I can sailplane you can sailplane she can sailplane we can sailplane you can sailplane they can sailplane
V-ing form
I can be sailplaning you can be sailplaning she can be sailplaning we can be sailplaning you can be sailplaning they can be sailplaning
Perfect
I can have sailplaned you can have sailplaned she can have sailplaned we can have sailplaned you can have sailplaned they can have sailplaned
V-ing perfect
I can have been sailplaning you can have been sailplaning she can have been sailplaning we can have been sailplaning you can have been sailplaning they can have been sailplaning
Negation
Simple form
I can't sailplane you can't sailplane she can't sailplane we can't sailplane you can't sailplane they can't sailplane
V-ing form
I can't be sailplaning you can't be sailplaning she can't be sailplaning we can't be sailplaning you can't be sailplaning they can't be sailplaning
Perfect
I can't have sailplaned you can't have sailplaned she can't have sailplaned we can't have sailplaned you can't have sailplaned they can't have sailplaned
V-ing perfect
I can't have been sailplaning you can't have been sailplaning she can't have been sailplaning we can't have been sailplaning you can't have been sailplaning they can't have been sailplaning
Interrogative form
Simple form
can I sailplane? can you sailplane? can she sailplane? can we sailplane? can you sailplane? can they sailplane?
V-ing form
can I be sailplaning? can you be sailplaning? can she be sailplaning? can we be sailplaning? can you be sailplaning? can they be sailplaning?
Perfect
can I have sailplaned? can you have sailplaned? can she have sailplaned? can we have sailplaned? can you have sailplaned? can they have sailplaned?
V-ing perfect
can I have been sailplaning? can you have been sailplaning? can she have been sailplaning? can we have been sailplaning? can you have been sailplaning? can they have been sailplaning?
Interro-negative form
Simple form
can't I sailplane? can't you sailplane? can't she sailplane? can't we sailplane? can't you sailplane? can't they sailplane?
V-ing form
can't I be sailplaning? can't you be sailplaning? can't she be sailplaning? can't we be sailplaning? can't you be sailplaning? can't they be sailplaning?
Perfect
can't I have sailplaned? can't you have sailplaned? can't she have sailplaned? can't we have sailplaned? can't you have sailplaned? can't they have sailplaned?
V-ing perfect
can't I have been sailplaning? can't you have been sailplaning? can't she have been sailplaning? can't we have been sailplaning? can't you have been sailplaning? can't they have been sailplaning?