I can pencil you can pencil she can pencil we can pencil you can pencil they can pencil
V-ing form
I can be pencilling you can be pencilling she can be pencilling we can be pencilling you can be pencilling they can be pencilling
Perfect
I can have pencilled you can have pencilled she can have pencilled we can have pencilled you can have pencilled they can have pencilled
V-ing perfect
I can have been pencilling you can have been pencilling she can have been pencilling we can have been pencilling you can have been pencilling they can have been pencilling
Negation
Simple form
I can't pencil you can't pencil she can't pencil we can't pencil you can't pencil they can't pencil
V-ing form
I can't be pencilling you can't be pencilling she can't be pencilling we can't be pencilling you can't be pencilling they can't be pencilling
Perfect
I can't have pencilled you can't have pencilled she can't have pencilled we can't have pencilled you can't have pencilled they can't have pencilled
V-ing perfect
I can't have been pencilling you can't have been pencilling she can't have been pencilling we can't have been pencilling you can't have been pencilling they can't have been pencilling
Interrogative form
Simple form
can I pencil? can you pencil? can she pencil? can we pencil? can you pencil? can they pencil?
V-ing form
can I be pencilling? can you be pencilling? can she be pencilling? can we be pencilling? can you be pencilling? can they be pencilling?
Perfect
can I have pencilled? can you have pencilled? can she have pencilled? can we have pencilled? can you have pencilled? can they have pencilled?
V-ing perfect
can I have been pencilling? can you have been pencilling? can she have been pencilling? can we have been pencilling? can you have been pencilling? can they have been pencilling?
Interro-negative form
Simple form
can't I pencil? can't you pencil? can't she pencil? can't we pencil? can't you pencil? can't they pencil?
V-ing form
can't I be pencilling? can't you be pencilling? can't she be pencilling? can't we be pencilling? can't you be pencilling? can't they be pencilling?
Perfect
can't I have pencilled? can't you have pencilled? can't she have pencilled? can't we have pencilled? can't you have pencilled? can't they have pencilled?
V-ing perfect
can't I have been pencilling? can't you have been pencilling? can't she have been pencilling? can't we have been pencilling? can't you have been pencilling? can't they have been pencilling?