can thank
Regular verb: thank - thanked- thanked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can thank
you can thank
he can thank
we can thank
you can thank
they can thank 	I can be thanking
you can be thanking
he can be thanking
we can be thanking
you can be thanking
they can be thanking	I can have thanked
you can have thanked
he can have thanked
we can have thanked
you can have thanked
they can have thanked	I can have been thanking
you can have been thanking
he can have been thanking
we can have been thanking
you can have been thanking
they can have been thanking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't thank
you can't thank
he can't thank
we can't thank
you can't thank
they can't thank 	I can't be thanking
you can't be thanking
he can't be thanking
we can't be thanking
you can't be thanking
they can't be thanking	I can't have thanked
you can't have thanked
he can't have thanked
we can't have thanked
you can't have thanked
they can't have thanked	I can't have been thanking
you can't have been thanking
he can't have been thanking
we can't have been thanking
you can't have been thanking
they can't have been thanking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I thank?
can you thank?
can he thank?
can we thank?
can you thank?
can they thank? 	can I be thanking?
can you be thanking?
can he be thanking?
can we be thanking?
can you be thanking?
can they be thanking? 	can I have thanked?
can you have thanked?
can he have thanked?
can we have thanked?
can you have thanked?
can they have thanked? 	can I have been thanking?
can you have been thanking?
can he have been thanking?
can we have been thanking?
can you have been thanking?
can they have been thanking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I thank?
can't you thank?
can't he thank?
can't we thank?
can't you thank?
can't they thank? 	can't I be thanking?
can't you be thanking?
can't he be thanking?
can't we be thanking?
can't you be thanking?
can't they be thanking? 	can't I have thanked?
can't you have thanked?
can't he have thanked?
can't we have thanked?
can't you have thanked?
can't they have thanked? 	can't I have been thanking?
can't you have been thanking?
can't he have been thanking?
can't we have been thanking?
can't you have been thanking?
can't they have been thanking?