could testify
Regular verb: testify - testified- testified

Affirmation 	
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I could testify
you could testify
she could testify
we could testify
you could testify
they could testify 	I could be testifying
you could be testifying
she could be testifying
we could be testifying
you could be testifying
they could be testifying	I could have testified
you could have testified
she could have testified
we could have testified
you could have testified
they could have testified	I could have been testifying
you could have been testifying
she could have been testifying
we could have been testifying
you could have been testifying
they could have been testifying	

Negation 	
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I couldn't testify
you couldn't testify
she couldn't testify
we couldn't testify
you couldn't testify
they couldn't testify 	I couldn't be testifying
you couldn't be testifying
she couldn't be testifying
we couldn't be testifying
you couldn't be testifying
they couldn't be testifying	I couldn't have testified
you couldn't have testified
she couldn't have testified
we couldn't have testified
you couldn't have testified
they couldn't have testified	I couldn't have been testifying
you couldn't have been testifying
she couldn't have been testifying
we couldn't have been testifying
you couldn't have been testifying
they couldn't have been testifying	

Interrogative form 	
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could I testify?
could you testify?
could she testify?
could we testify?
could you testify?
could they testify? 	could I be testifying?
could you be testifying?
could she be testifying?
could we be testifying?
could you be testifying?
could they be testifying? 	could I have testified?
could you have testified?
could she have testified?
could we have testified?
could you have testified?
could they have testified? 	could I have been testifying?
could you have been testifying?
could she have been testifying?
could we have been testifying?
could you have been testifying?
could they have been testifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I testify?
couldn't you testify?
couldn't she testify?
couldn't we testify?
couldn't you testify?
couldn't they testify? 	couldn't I be testifying?
couldn't you be testifying?
couldn't she be testifying?
couldn't we be testifying?
couldn't you be testifying?
couldn't they be testifying? 	couldn't I have testified?
couldn't you have testified?
couldn't she have testified?
couldn't we have testified?
couldn't you have testified?
couldn't they have testified? 	couldn't I have been testifying?
couldn't you have been testifying?
couldn't she have been testifying?
couldn't we have been testifying?
couldn't you have been testifying?
couldn't they have been testifying?