can thunk
Regular verb: thunk - thunked- thunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can thunk
you can thunk
she can thunk
we can thunk
you can thunk
they can thunk 	I can be thunking
you can be thunking
she can be thunking
we can be thunking
you can be thunking
they can be thunking	I can have thunked
you can have thunked
she can have thunked
we can have thunked
you can have thunked
they can have thunked	I can have been thunking
you can have been thunking
she can have been thunking
we can have been thunking
you can have been thunking
they can have been thunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot thunk
you cannot thunk
she cannot thunk
we cannot thunk
you cannot thunk
they cannot thunk 	I cannot be thunking
you cannot be thunking
she cannot be thunking
we cannot be thunking
you cannot be thunking
they cannot be thunking	I cannot have thunked
you cannot have thunked
she cannot have thunked
we cannot have thunked
you cannot have thunked
they cannot have thunked	I cannot have been thunking
you cannot have been thunking
she cannot have been thunking
we cannot have been thunking
you cannot have been thunking
they cannot have been thunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I thunk?
can you thunk?
can she thunk?
can we thunk?
can you thunk?
can they thunk? 	can I be thunking?
can you be thunking?
can she be thunking?
can we be thunking?
can you be thunking?
can they be thunking? 	can I have thunked?
can you have thunked?
can she have thunked?
can we have thunked?
can you have thunked?
can they have thunked? 	can I have been thunking?
can you have been thunking?
can she have been thunking?
can we have been thunking?
can you have been thunking?
can they have been thunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not thunk?
can you not thunk?
can she not thunk?
can we not thunk?
can you not thunk?
can they not thunk? 	can I not be thunking?
can you not be thunking?
can she not be thunking?
can we not be thunking?
can you not be thunking?
can they not be thunking? 	can I not have thunked?
can you not have thunked?
can she not have thunked?
can we not have thunked?
can you not have thunked?
can they not have thunked? 	can I not have been thunking?
can you not have been thunking?
can she not have been thunking?
can we not have been thunking?
can you not have been thunking?
can they not have been thunking?