could sequence
Regular verb: sequence - sequenced- sequenced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sequence
you could sequence
he could sequence
we could sequence
you could sequence
they could sequence 	I could be sequencing
you could be sequencing
he could be sequencing
we could be sequencing
you could be sequencing
they could be sequencing	I could have sequenced
you could have sequenced
he could have sequenced
we could have sequenced
you could have sequenced
they could have sequenced	I could have been sequencing
you could have been sequencing
he could have been sequencing
we could have been sequencing
you could have been sequencing
they could have been sequencing	

Negation 	
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I couldn't sequence
you couldn't sequence
he couldn't sequence
we couldn't sequence
you couldn't sequence
they couldn't sequence 	I couldn't be sequencing
you couldn't be sequencing
he couldn't be sequencing
we couldn't be sequencing
you couldn't be sequencing
they couldn't be sequencing	I couldn't have sequenced
you couldn't have sequenced
he couldn't have sequenced
we couldn't have sequenced
you couldn't have sequenced
they couldn't have sequenced	I couldn't have been sequencing
you couldn't have been sequencing
he couldn't have been sequencing
we couldn't have been sequencing
you couldn't have been sequencing
they couldn't have been sequencing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sequence?
could you sequence?
could he sequence?
could we sequence?
could you sequence?
could they sequence? 	could I be sequencing?
could you be sequencing?
could he be sequencing?
could we be sequencing?
could you be sequencing?
could they be sequencing? 	could I have sequenced?
could you have sequenced?
could he have sequenced?
could we have sequenced?
could you have sequenced?
could they have sequenced? 	could I have been sequencing?
could you have been sequencing?
could he have been sequencing?
could we have been sequencing?
could you have been sequencing?
could they have been sequencing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sequence?
couldn't you sequence?
couldn't he sequence?
couldn't we sequence?
couldn't you sequence?
couldn't they sequence? 	couldn't I be sequencing?
couldn't you be sequencing?
couldn't he be sequencing?
couldn't we be sequencing?
couldn't you be sequencing?
couldn't they be sequencing? 	couldn't I have sequenced?
couldn't you have sequenced?
couldn't he have sequenced?
couldn't we have sequenced?
couldn't you have sequenced?
couldn't they have sequenced? 	couldn't I have been sequencing?
couldn't you have been sequencing?
couldn't he have been sequencing?
couldn't we have been sequencing?
couldn't you have been sequencing?
couldn't they have been sequencing?