could waste
Regular verb: waste - wasted- wasted

Affirmation 	
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I could waste
you could waste
she could waste
we could waste
you could waste
they could waste 	I could be wasting
you could be wasting
she could be wasting
we could be wasting
you could be wasting
they could be wasting	I could have wasted
you could have wasted
she could have wasted
we could have wasted
you could have wasted
they could have wasted	I could have been wasting
you could have been wasting
she could have been wasting
we could have been wasting
you could have been wasting
they could have been wasting	

Negation 	
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I could not waste
you could not waste
she could not waste
we could not waste
you could not waste
they could not waste 	I could not be wasting
you could not be wasting
she could not be wasting
we could not be wasting
you could not be wasting
they could not be wasting	I could not have wasted
you could not have wasted
she could not have wasted
we could not have wasted
you could not have wasted
they could not have wasted	I could not have been wasting
you could not have been wasting
she could not have been wasting
we could not have been wasting
you could not have been wasting
they could not have been wasting	

Interrogative form 	
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could I waste?
could you waste?
could she waste?
could we waste?
could you waste?
could they waste? 	could I be wasting?
could you be wasting?
could she be wasting?
could we be wasting?
could you be wasting?
could they be wasting? 	could I have wasted?
could you have wasted?
could she have wasted?
could we have wasted?
could you have wasted?
could they have wasted? 	could I have been wasting?
could you have been wasting?
could she have been wasting?
could we have been wasting?
could you have been wasting?
could they have been wasting? 	

Interro-negative form 	
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could I not waste?
could you not waste?
could she not waste?
could we not waste?
could you not waste?
could they not waste? 	could I not be wasting?
could you not be wasting?
could she not be wasting?
could we not be wasting?
could you not be wasting?
could they not be wasting? 	could I not have wasted?
could you not have wasted?
could she not have wasted?
could we not have wasted?
could you not have wasted?
could they not have wasted? 	could I not have been wasting?
could you not have been wasting?
could she not have been wasting?
could we not have been wasting?
could you not have been wasting?
could they not have been wasting?