could tiptoe
Regular verb: tiptoe - tiptoed- tiptoed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tiptoe
you could tiptoe
he could tiptoe
we could tiptoe
you could tiptoe
they could tiptoe 	I could be tiptoing
you could be tiptoing
he could be tiptoing
we could be tiptoing
you could be tiptoing
they could be tiptoing	I could have tiptoed
you could have tiptoed
he could have tiptoed
we could have tiptoed
you could have tiptoed
they could have tiptoed	I could have been tiptoing
you could have been tiptoing
he could have been tiptoing
we could have been tiptoing
you could have been tiptoing
they could have been tiptoing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tiptoe
you couldn't tiptoe
he couldn't tiptoe
we couldn't tiptoe
you couldn't tiptoe
they couldn't tiptoe 	I couldn't be tiptoing
you couldn't be tiptoing
he couldn't be tiptoing
we couldn't be tiptoing
you couldn't be tiptoing
they couldn't be tiptoing	I couldn't have tiptoed
you couldn't have tiptoed
he couldn't have tiptoed
we couldn't have tiptoed
you couldn't have tiptoed
they couldn't have tiptoed	I couldn't have been tiptoing
you couldn't have been tiptoing
he couldn't have been tiptoing
we couldn't have been tiptoing
you couldn't have been tiptoing
they couldn't have been tiptoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tiptoe?
could you tiptoe?
could he tiptoe?
could we tiptoe?
could you tiptoe?
could they tiptoe? 	could I be tiptoing?
could you be tiptoing?
could he be tiptoing?
could we be tiptoing?
could you be tiptoing?
could they be tiptoing? 	could I have tiptoed?
could you have tiptoed?
could he have tiptoed?
could we have tiptoed?
could you have tiptoed?
could they have tiptoed? 	could I have been tiptoing?
could you have been tiptoing?
could he have been tiptoing?
could we have been tiptoing?
could you have been tiptoing?
could they have been tiptoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tiptoe?
couldn't you tiptoe?
couldn't he tiptoe?
couldn't we tiptoe?
couldn't you tiptoe?
couldn't they tiptoe? 	couldn't I be tiptoing?
couldn't you be tiptoing?
couldn't he be tiptoing?
couldn't we be tiptoing?
couldn't you be tiptoing?
couldn't they be tiptoing? 	couldn't I have tiptoed?
couldn't you have tiptoed?
couldn't he have tiptoed?
couldn't we have tiptoed?
couldn't you have tiptoed?
couldn't they have tiptoed? 	couldn't I have been tiptoing?
couldn't you have been tiptoing?
couldn't he have been tiptoing?
couldn't we have been tiptoing?
couldn't you have been tiptoing?
couldn't they have been tiptoing?