could chelate
Regular verb: chelate - chelated- chelated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could chelate
you could chelate
he could chelate
we could chelate
you could chelate
they could chelate 	I could be chelating
you could be chelating
he could be chelating
we could be chelating
you could be chelating
they could be chelating	I could have chelated
you could have chelated
he could have chelated
we could have chelated
you could have chelated
they could have chelated	I could have been chelating
you could have been chelating
he could have been chelating
we could have been chelating
you could have been chelating
they could have been chelating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't chelate
you couldn't chelate
he couldn't chelate
we couldn't chelate
you couldn't chelate
they couldn't chelate 	I couldn't be chelating
you couldn't be chelating
he couldn't be chelating
we couldn't be chelating
you couldn't be chelating
they couldn't be chelating	I couldn't have chelated
you couldn't have chelated
he couldn't have chelated
we couldn't have chelated
you couldn't have chelated
they couldn't have chelated	I couldn't have been chelating
you couldn't have been chelating
he couldn't have been chelating
we couldn't have been chelating
you couldn't have been chelating
they couldn't have been chelating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I chelate?
could you chelate?
could he chelate?
could we chelate?
could you chelate?
could they chelate? 	could I be chelating?
could you be chelating?
could he be chelating?
could we be chelating?
could you be chelating?
could they be chelating? 	could I have chelated?
could you have chelated?
could he have chelated?
could we have chelated?
could you have chelated?
could they have chelated? 	could I have been chelating?
could you have been chelating?
could he have been chelating?
could we have been chelating?
could you have been chelating?
could they have been chelating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I chelate?
couldn't you chelate?
couldn't he chelate?
couldn't we chelate?
couldn't you chelate?
couldn't they chelate? 	couldn't I be chelating?
couldn't you be chelating?
couldn't he be chelating?
couldn't we be chelating?
couldn't you be chelating?
couldn't they be chelating? 	couldn't I have chelated?
couldn't you have chelated?
couldn't he have chelated?
couldn't we have chelated?
couldn't you have chelated?
couldn't they have chelated? 	couldn't I have been chelating?
couldn't you have been chelating?
couldn't he have been chelating?
couldn't we have been chelating?
couldn't you have been chelating?
couldn't they have been chelating?