could serge
Regular verb: serge - serged- serged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could serge
you could serge
she could serge
we could serge
you could serge
they could serge 	I could be serging
you could be serging
she could be serging
we could be serging
you could be serging
they could be serging	I could have serged
you could have serged
she could have serged
we could have serged
you could have serged
they could have serged	I could have been serging
you could have been serging
she could have been serging
we could have been serging
you could have been serging
they could have been serging	

Negation 	
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I couldn't serge
you couldn't serge
she couldn't serge
we couldn't serge
you couldn't serge
they couldn't serge 	I couldn't be serging
you couldn't be serging
she couldn't be serging
we couldn't be serging
you couldn't be serging
they couldn't be serging	I couldn't have serged
you couldn't have serged
she couldn't have serged
we couldn't have serged
you couldn't have serged
they couldn't have serged	I couldn't have been serging
you couldn't have been serging
she couldn't have been serging
we couldn't have been serging
you couldn't have been serging
they couldn't have been serging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I serge?
could you serge?
could she serge?
could we serge?
could you serge?
could they serge? 	could I be serging?
could you be serging?
could she be serging?
could we be serging?
could you be serging?
could they be serging? 	could I have serged?
could you have serged?
could she have serged?
could we have serged?
could you have serged?
could they have serged? 	could I have been serging?
could you have been serging?
could she have been serging?
could we have been serging?
could you have been serging?
could they have been serging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I serge?
couldn't you serge?
couldn't she serge?
couldn't we serge?
couldn't you serge?
couldn't they serge? 	couldn't I be serging?
couldn't you be serging?
couldn't she be serging?
couldn't we be serging?
couldn't you be serging?
couldn't they be serging? 	couldn't I have serged?
couldn't you have serged?
couldn't she have serged?
couldn't we have serged?
couldn't you have serged?
couldn't they have serged? 	couldn't I have been serging?
couldn't you have been serging?
couldn't she have been serging?
couldn't we have been serging?
couldn't you have been serging?
couldn't they have been serging?