could boo
Regular verb: boo - booed- booed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could boo
you could boo
he could boo
we could boo
you could boo
they could boo 	I could be booing
you could be booing
he could be booing
we could be booing
you could be booing
they could be booing	I could have booed
you could have booed
he could have booed
we could have booed
you could have booed
they could have booed	I could have been booing
you could have been booing
he could have been booing
we could have been booing
you could have been booing
they could have been booing	

Negation 	
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I could not boo
you could not boo
he could not boo
we could not boo
you could not boo
they could not boo 	I could not be booing
you could not be booing
he could not be booing
we could not be booing
you could not be booing
they could not be booing	I could not have booed
you could not have booed
he could not have booed
we could not have booed
you could not have booed
they could not have booed	I could not have been booing
you could not have been booing
he could not have been booing
we could not have been booing
you could not have been booing
they could not have been booing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I boo?
could you boo?
could he boo?
could we boo?
could you boo?
could they boo? 	could I be booing?
could you be booing?
could he be booing?
could we be booing?
could you be booing?
could they be booing? 	could I have booed?
could you have booed?
could he have booed?
could we have booed?
could you have booed?
could they have booed? 	could I have been booing?
could you have been booing?
could he have been booing?
could we have been booing?
could you have been booing?
could they have been booing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not boo?
could you not boo?
could he not boo?
could we not boo?
could you not boo?
could they not boo? 	could I not be booing?
could you not be booing?
could he not be booing?
could we not be booing?
could you not be booing?
could they not be booing? 	could I not have booed?
could you not have booed?
could he not have booed?
could we not have booed?
could you not have booed?
could they not have booed? 	could I not have been booing?
could you not have been booing?
could he not have been booing?
could we not have been booing?
could you not have been booing?
could they not have been booing?