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 cannot timber you cannot timber she cannot timber we cannot timber you cannot timber they cannot timber	I cannot be timbering you cannot be timbering she cannot be timbering we cannot be timbering you cannot be timbering they cannot be timbering
Perfect	V-ing perfect
I cannot have timbered you cannot have timbered she cannot have timbered we cannot have timbered you cannot have timbered they cannot have timbered	I cannot have been timbering you cannot have been timbering she cannot have been timbering we cannot have been timbering you cannot have been timbering they cannot 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 I not timber? can you not timber? can she not timber? can we not timber? can you not timber? can they not timber?	can I not be timbering? can you not be timbering? can she not be timbering? can we not be timbering? can you not be timbering? can they not be timbering?
Perfect	V-ing perfect
can I not have timbered? can you not have timbered? can she not have timbered? can we not have timbered? can you not have timbered? can they not have timbered?	can I not have been timbering? can you not have been timbering? can she not have been timbering? can we not have been timbering? can you not have been timbering? can they not have been timbering?