can timber
Regular verb: timber - timbered- timbered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can timber
you can timber
he can timber
we can timber
you can timber
they can timber 	I can be timbering
you can be timbering
he can be timbering
we can be timbering
you can be timbering
they can be timbering	I can have timbered
you can have timbered
he 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
he 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 	Perfect 	V-ing perfect 	
I cannot timber
you cannot timber
he cannot timber
we cannot timber
you cannot timber
they cannot timber 	I cannot be timbering
you cannot be timbering
he cannot be timbering
we cannot be timbering
you cannot be timbering
they cannot be timbering	I cannot have timbered
you cannot have timbered
he 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
he 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 	Perfect 	V-ing perfect 	
can I timber?
can you timber?
can he timber?
can we timber?
can you timber?
can they timber? 	can I be timbering?
can you be timbering?
can he be timbering?
can we be timbering?
can you be timbering?
can they be timbering? 	can I have timbered?
can you have timbered?
can he 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 he 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 	Perfect 	V-ing perfect 	
can I not timber?
can you not timber?
can he 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 he not be timbering?
can we not be timbering?
can you not be timbering?
can they not be timbering? 	can I not have timbered?
can you not have timbered?
can he 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 he not have been timbering?
can we not have been timbering?
can you not have been timbering?
can they not have been timbering?