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 	
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I cannot thank
you cannot thank
he cannot thank
we cannot thank
you cannot thank
they cannot thank 	I cannot be thanking
you cannot be thanking
he cannot be thanking
we cannot be thanking
you cannot be thanking
they cannot be thanking	I cannot have thanked
you cannot have thanked
he cannot have thanked
we cannot have thanked
you cannot have thanked
they cannot have thanked	I cannot have been thanking
you cannot have been thanking
he cannot have been thanking
we cannot have been thanking
you cannot have been thanking
they cannot 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 I not thank?
can you not thank?
can he not thank?
can we not thank?
can you not thank?
can they not thank? 	can I not be thanking?
can you not be thanking?
can he not be thanking?
can we not be thanking?
can you not be thanking?
can they not be thanking? 	can I not have thanked?
can you not have thanked?
can he not have thanked?
can we not have thanked?
can you not have thanked?
can they not have thanked? 	can I not have been thanking?
can you not have been thanking?
can he not have been thanking?
can we not have been thanking?
can you not have been thanking?
can they not have been thanking?