English verb conjugation
CAN TIMBER

Regular verb: timber - timbered - timbered

Affirmation

Simple form	V-ing form
I can timber you can timber she can timber we can timber you can timber they can timber	I can be timbering you can be timbering she can be timbering we can be timbering you can be timbering they can be timbering
Perfect	V-ing perfect
I can have timbered you can have timbered she can have timbered we can have timbered you can have timbered they can have timbered	I can have been timbering you can have been timbering she can have been timbering we can have been timbering you can have been timbering they can have been timbering

Negation

Simple form	V-ing form
I can't timber you can't timber she can't timber we can't timber you can't timber they can't timber	I can't be timbering you can't be timbering she can't be timbering we can't be timbering you can't be timbering they can't be timbering
Perfect	V-ing perfect
I can't have timbered you can't have timbered she can't have timbered we can't have timbered you can't have timbered they can't have timbered	I can't have been timbering you can't have been timbering she can't have been timbering we can't have been timbering you can't have been timbering they can't have been timbering

Interrogative form

Simple form	V-ing form
can I timber? can you timber? can she timber? can we timber? can you timber? can they timber?	can I be timbering? can you be timbering? can she be timbering? can we be timbering? can you be timbering? can they be timbering?
Perfect	V-ing perfect
can I have timbered? can you have timbered? can she have timbered? can we have timbered? can you have timbered? can they have timbered?	can I have been timbering? can you have been timbering? can she have been timbering? can we have been timbering? can you have been timbering? can they have been timbering?

Interro-negative form

Simple form	V-ing form
can't I timber? can't you timber? can't she timber? can't we timber? can't you timber? can't they timber?	can't I be timbering? can't you be timbering? can't she be timbering? can't we be timbering? can't you be timbering? can't they be timbering?
Perfect	V-ing perfect
can't I have timbered? can't you have timbered? can't she have timbered? can't we have timbered? can't you have timbered? can't they have timbered?	can't I have been timbering? can't you have been timbering? can't she have been timbering? can't we have been timbering? can't you have been timbering? can't they have been timbering?