could decimalise
Regular verb: decimalise - decimalised- decimalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could decimalise
you could decimalise
he could decimalise
we could decimalise
you could decimalise
they could decimalise 	I could be decimalising
you could be decimalising
he could be decimalising
we could be decimalising
you could be decimalising
they could be decimalising	I could have decimalised
you could have decimalised
he could have decimalised
we could have decimalised
you could have decimalised
they could have decimalised	I could have been decimalising
you could have been decimalising
he could have been decimalising
we could have been decimalising
you could have been decimalising
they could have been decimalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't decimalise
you couldn't decimalise
he couldn't decimalise
we couldn't decimalise
you couldn't decimalise
they couldn't decimalise 	I couldn't be decimalising
you couldn't be decimalising
he couldn't be decimalising
we couldn't be decimalising
you couldn't be decimalising
they couldn't be decimalising	I couldn't have decimalised
you couldn't have decimalised
he couldn't have decimalised
we couldn't have decimalised
you couldn't have decimalised
they couldn't have decimalised	I couldn't have been decimalising
you couldn't have been decimalising
he couldn't have been decimalising
we couldn't have been decimalising
you couldn't have been decimalising
they couldn't have been decimalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I decimalise?
could you decimalise?
could he decimalise?
could we decimalise?
could you decimalise?
could they decimalise? 	could I be decimalising?
could you be decimalising?
could he be decimalising?
could we be decimalising?
could you be decimalising?
could they be decimalising? 	could I have decimalised?
could you have decimalised?
could he have decimalised?
could we have decimalised?
could you have decimalised?
could they have decimalised? 	could I have been decimalising?
could you have been decimalising?
could he have been decimalising?
could we have been decimalising?
could you have been decimalising?
could they have been decimalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I decimalise?
couldn't you decimalise?
couldn't he decimalise?
couldn't we decimalise?
couldn't you decimalise?
couldn't they decimalise? 	couldn't I be decimalising?
couldn't you be decimalising?
couldn't he be decimalising?
couldn't we be decimalising?
couldn't you be decimalising?
couldn't they be decimalising? 	couldn't I have decimalised?
couldn't you have decimalised?
couldn't he have decimalised?
couldn't we have decimalised?
couldn't you have decimalised?
couldn't they have decimalised? 	couldn't I have been decimalising?
couldn't you have been decimalising?
couldn't he have been decimalising?
couldn't we have been decimalising?
couldn't you have been decimalising?
couldn't they have been decimalising?