could syncopate
Regular verb: syncopate - syncopated- syncopated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could syncopate
you could syncopate
she could syncopate
we could syncopate
you could syncopate
they could syncopate 	I could be syncopating
you could be syncopating
she could be syncopating
we could be syncopating
you could be syncopating
they could be syncopating	I could have syncopated
you could have syncopated
she could have syncopated
we could have syncopated
you could have syncopated
they could have syncopated	I could have been syncopating
you could have been syncopating
she could have been syncopating
we could have been syncopating
you could have been syncopating
they could have been syncopating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't syncopate
you couldn't syncopate
she couldn't syncopate
we couldn't syncopate
you couldn't syncopate
they couldn't syncopate 	I couldn't be syncopating
you couldn't be syncopating
she couldn't be syncopating
we couldn't be syncopating
you couldn't be syncopating
they couldn't be syncopating	I couldn't have syncopated
you couldn't have syncopated
she couldn't have syncopated
we couldn't have syncopated
you couldn't have syncopated
they couldn't have syncopated	I couldn't have been syncopating
you couldn't have been syncopating
she couldn't have been syncopating
we couldn't have been syncopating
you couldn't have been syncopating
they couldn't have been syncopating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I syncopate?
could you syncopate?
could she syncopate?
could we syncopate?
could you syncopate?
could they syncopate? 	could I be syncopating?
could you be syncopating?
could she be syncopating?
could we be syncopating?
could you be syncopating?
could they be syncopating? 	could I have syncopated?
could you have syncopated?
could she have syncopated?
could we have syncopated?
could you have syncopated?
could they have syncopated? 	could I have been syncopating?
could you have been syncopating?
could she have been syncopating?
could we have been syncopating?
could you have been syncopating?
could they have been syncopating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I syncopate?
couldn't you syncopate?
couldn't she syncopate?
couldn't we syncopate?
couldn't you syncopate?
couldn't they syncopate? 	couldn't I be syncopating?
couldn't you be syncopating?
couldn't she be syncopating?
couldn't we be syncopating?
couldn't you be syncopating?
couldn't they be syncopating? 	couldn't I have syncopated?
couldn't you have syncopated?
couldn't she have syncopated?
couldn't we have syncopated?
couldn't you have syncopated?
couldn't they have syncopated? 	couldn't I have been syncopating?
couldn't you have been syncopating?
couldn't she have been syncopating?
couldn't we have been syncopating?
couldn't you have been syncopating?
couldn't they have been syncopating?