must thunk
Regular verb: thunk - thunked- thunked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not thunk
you must not thunk
he must not thunk
we must not thunk
you must not thunk
they must not thunk 	I must not be thunking
you must not be thunking
he must not be thunking
we must not be thunking
you must not be thunking
they must not be thunking	I must not have thunked
you must not have thunked
he must not have thunked
we must not have thunked
you must not have thunked
they must not have thunked	I must not have been thunking
you must not have been thunking
he must not have been thunking
we must not have been thunking
you must not have been thunking
they must not have been thunking	

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

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