can clunk
Regular verb: clunk - clunked- clunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can clunk
you can clunk
he can clunk
we can clunk
you can clunk
they can clunk 	I can be clunking
you can be clunking
he can be clunking
we can be clunking
you can be clunking
they can be clunking	I can have clunked
you can have clunked
he can have clunked
we can have clunked
you can have clunked
they can have clunked	I can have been clunking
you can have been clunking
he can have been clunking
we can have been clunking
you can have been clunking
they can have been clunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't clunk
you can't clunk
he can't clunk
we can't clunk
you can't clunk
they can't clunk 	I can't be clunking
you can't be clunking
he can't be clunking
we can't be clunking
you can't be clunking
they can't be clunking	I can't have clunked
you can't have clunked
he can't have clunked
we can't have clunked
you can't have clunked
they can't have clunked	I can't have been clunking
you can't have been clunking
he can't have been clunking
we can't have been clunking
you can't have been clunking
they can't have been clunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I clunk?
can you clunk?
can he clunk?
can we clunk?
can you clunk?
can they clunk? 	can I be clunking?
can you be clunking?
can he be clunking?
can we be clunking?
can you be clunking?
can they be clunking? 	can I have clunked?
can you have clunked?
can he have clunked?
can we have clunked?
can you have clunked?
can they have clunked? 	can I have been clunking?
can you have been clunking?
can he have been clunking?
can we have been clunking?
can you have been clunking?
can they have been clunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I clunk?
can't you clunk?
can't he clunk?
can't we clunk?
can't you clunk?
can't they clunk? 	can't I be clunking?
can't you be clunking?
can't he be clunking?
can't we be clunking?
can't you be clunking?
can't they be clunking? 	can't I have clunked?
can't you have clunked?
can't he have clunked?
can't we have clunked?
can't you have clunked?
can't they have clunked? 	can't I have been clunking?
can't you have been clunking?
can't he have been clunking?
can't we have been clunking?
can't you have been clunking?
can't they have been clunking?