could syringe
Regular verb: syringe - syringed- syringed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could syringe
you could syringe
she could syringe
we could syringe
you could syringe
they could syringe 	I could be syringing
you could be syringing
she could be syringing
we could be syringing
you could be syringing
they could be syringing	I could have syringed
you could have syringed
she could have syringed
we could have syringed
you could have syringed
they could have syringed	I could have been syringing
you could have been syringing
she could have been syringing
we could have been syringing
you could have been syringing
they could have been syringing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't syringe
you couldn't syringe
she couldn't syringe
we couldn't syringe
you couldn't syringe
they couldn't syringe 	I couldn't be syringing
you couldn't be syringing
she couldn't be syringing
we couldn't be syringing
you couldn't be syringing
they couldn't be syringing	I couldn't have syringed
you couldn't have syringed
she couldn't have syringed
we couldn't have syringed
you couldn't have syringed
they couldn't have syringed	I couldn't have been syringing
you couldn't have been syringing
she couldn't have been syringing
we couldn't have been syringing
you couldn't have been syringing
they couldn't have been syringing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I syringe?
could you syringe?
could she syringe?
could we syringe?
could you syringe?
could they syringe? 	could I be syringing?
could you be syringing?
could she be syringing?
could we be syringing?
could you be syringing?
could they be syringing? 	could I have syringed?
could you have syringed?
could she have syringed?
could we have syringed?
could you have syringed?
could they have syringed? 	could I have been syringing?
could you have been syringing?
could she have been syringing?
could we have been syringing?
could you have been syringing?
could they have been syringing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I syringe?
couldn't you syringe?
couldn't she syringe?
couldn't we syringe?
couldn't you syringe?
couldn't they syringe? 	couldn't I be syringing?
couldn't you be syringing?
couldn't she be syringing?
couldn't we be syringing?
couldn't you be syringing?
couldn't they be syringing? 	couldn't I have syringed?
couldn't you have syringed?
couldn't she have syringed?
couldn't we have syringed?
couldn't you have syringed?
couldn't they have syringed? 	couldn't I have been syringing?
couldn't you have been syringing?
couldn't she have been syringing?
couldn't we have been syringing?
couldn't you have been syringing?
couldn't they have been syringing?