could louden
Regular verb: louden - loudened- loudened

Affirmation 	
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I could louden
you could louden
he could louden
we could louden
you could louden
they could louden 	I could be loudening
you could be loudening
he could be loudening
we could be loudening
you could be loudening
they could be loudening	I could have loudened
you could have loudened
he could have loudened
we could have loudened
you could have loudened
they could have loudened	I could have been loudening
you could have been loudening
he could have been loudening
we could have been loudening
you could have been loudening
they could have been loudening	

Negation 	
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I could not louden
you could not louden
he could not louden
we could not louden
you could not louden
they could not louden 	I could not be loudening
you could not be loudening
he could not be loudening
we could not be loudening
you could not be loudening
they could not be loudening	I could not have loudened
you could not have loudened
he could not have loudened
we could not have loudened
you could not have loudened
they could not have loudened	I could not have been loudening
you could not have been loudening
he could not have been loudening
we could not have been loudening
you could not have been loudening
they could not have been loudening	

Interrogative form 	
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could I louden?
could you louden?
could he louden?
could we louden?
could you louden?
could they louden? 	could I be loudening?
could you be loudening?
could he be loudening?
could we be loudening?
could you be loudening?
could they be loudening? 	could I have loudened?
could you have loudened?
could he have loudened?
could we have loudened?
could you have loudened?
could they have loudened? 	could I have been loudening?
could you have been loudening?
could he have been loudening?
could we have been loudening?
could you have been loudening?
could they have been loudening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not louden?
could you not louden?
could he not louden?
could we not louden?
could you not louden?
could they not louden? 	could I not be loudening?
could you not be loudening?
could he not be loudening?
could we not be loudening?
could you not be loudening?
could they not be loudening? 	could I not have loudened?
could you not have loudened?
could he not have loudened?
could we not have loudened?
could you not have loudened?
could they not have loudened? 	could I not have been loudening?
could you not have been loudening?
could he not have been loudening?
could we not have been loudening?
could you not have been loudening?
could they not have been loudening?