could tambour
Regular verb: tambour - tamboured- tamboured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tambour
you could tambour
he could tambour
we could tambour
you could tambour
they could tambour 	I could be tambouring
you could be tambouring
he could be tambouring
we could be tambouring
you could be tambouring
they could be tambouring	I could have tamboured
you could have tamboured
he could have tamboured
we could have tamboured
you could have tamboured
they could have tamboured	I could have been tambouring
you could have been tambouring
he could have been tambouring
we could have been tambouring
you could have been tambouring
they could have been tambouring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tambour
you couldn't tambour
he couldn't tambour
we couldn't tambour
you couldn't tambour
they couldn't tambour 	I couldn't be tambouring
you couldn't be tambouring
he couldn't be tambouring
we couldn't be tambouring
you couldn't be tambouring
they couldn't be tambouring	I couldn't have tamboured
you couldn't have tamboured
he couldn't have tamboured
we couldn't have tamboured
you couldn't have tamboured
they couldn't have tamboured	I couldn't have been tambouring
you couldn't have been tambouring
he couldn't have been tambouring
we couldn't have been tambouring
you couldn't have been tambouring
they couldn't have been tambouring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tambour?
could you tambour?
could he tambour?
could we tambour?
could you tambour?
could they tambour? 	could I be tambouring?
could you be tambouring?
could he be tambouring?
could we be tambouring?
could you be tambouring?
could they be tambouring? 	could I have tamboured?
could you have tamboured?
could he have tamboured?
could we have tamboured?
could you have tamboured?
could they have tamboured? 	could I have been tambouring?
could you have been tambouring?
could he have been tambouring?
could we have been tambouring?
could you have been tambouring?
could they have been tambouring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tambour?
couldn't you tambour?
couldn't he tambour?
couldn't we tambour?
couldn't you tambour?
couldn't they tambour? 	couldn't I be tambouring?
couldn't you be tambouring?
couldn't he be tambouring?
couldn't we be tambouring?
couldn't you be tambouring?
couldn't they be tambouring? 	couldn't I have tamboured?
couldn't you have tamboured?
couldn't he have tamboured?
couldn't we have tamboured?
couldn't you have tamboured?
couldn't they have tamboured? 	couldn't I have been tambouring?
couldn't you have been tambouring?
couldn't he have been tambouring?
couldn't we have been tambouring?
couldn't you have been tambouring?
couldn't they have been tambouring?