could murmur
Regular verb: murmur - murmured- murmured

Affirmation 	
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I could murmur
you could murmur
she could murmur
we could murmur
you could murmur
they could murmur 	I could be murmuring
you could be murmuring
she could be murmuring
we could be murmuring
you could be murmuring
they could be murmuring	I could have murmured
you could have murmured
she could have murmured
we could have murmured
you could have murmured
they could have murmured	I could have been murmuring
you could have been murmuring
she could have been murmuring
we could have been murmuring
you could have been murmuring
they could have been murmuring	

Negation 	
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I couldn't murmur
you couldn't murmur
she couldn't murmur
we couldn't murmur
you couldn't murmur
they couldn't murmur 	I couldn't be murmuring
you couldn't be murmuring
she couldn't be murmuring
we couldn't be murmuring
you couldn't be murmuring
they couldn't be murmuring	I couldn't have murmured
you couldn't have murmured
she couldn't have murmured
we couldn't have murmured
you couldn't have murmured
they couldn't have murmured	I couldn't have been murmuring
you couldn't have been murmuring
she couldn't have been murmuring
we couldn't have been murmuring
you couldn't have been murmuring
they couldn't have been murmuring	

Interrogative form 	
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could I murmur?
could you murmur?
could she murmur?
could we murmur?
could you murmur?
could they murmur? 	could I be murmuring?
could you be murmuring?
could she be murmuring?
could we be murmuring?
could you be murmuring?
could they be murmuring? 	could I have murmured?
could you have murmured?
could she have murmured?
could we have murmured?
could you have murmured?
could they have murmured? 	could I have been murmuring?
could you have been murmuring?
could she have been murmuring?
could we have been murmuring?
could you have been murmuring?
could they have been murmuring? 	

Interro-negative form 	
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couldn't I murmur?
couldn't you murmur?
couldn't she murmur?
couldn't we murmur?
couldn't you murmur?
couldn't they murmur? 	couldn't I be murmuring?
couldn't you be murmuring?
couldn't she be murmuring?
couldn't we be murmuring?
couldn't you be murmuring?
couldn't they be murmuring? 	couldn't I have murmured?
couldn't you have murmured?
couldn't she have murmured?
couldn't we have murmured?
couldn't you have murmured?
couldn't they have murmured? 	couldn't I have been murmuring?
couldn't you have been murmuring?
couldn't she have been murmuring?
couldn't we have been murmuring?
couldn't you have been murmuring?
couldn't they have been murmuring?