could waste
Regular verb: waste - wasted- wasted

Affirmation 	
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I could waste
you could waste
he could waste
we could waste
you could waste
they could waste 	I could be wasting
you could be wasting
he could be wasting
we could be wasting
you could be wasting
they could be wasting	I could have wasted
you could have wasted
he 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
he 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
he 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
he 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
he 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
he 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 he waste?
could we waste?
could you waste?
could they waste? 	could I be wasting?
could you be wasting?
could he be wasting?
could we be wasting?
could you be wasting?
could they be wasting? 	could I have wasted?
could you have wasted?
could he 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 he 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 he 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 he 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 he 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 he not have been wasting?
could we not have been wasting?
could you not have been wasting?
could they not have been wasting?