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 couldn't waste
you couldn't waste
she couldn't waste
we couldn't waste
you couldn't waste
they couldn't waste 	I couldn't be wasting
you couldn't be wasting
she couldn't be wasting
we couldn't be wasting
you couldn't be wasting
they couldn't be wasting	I couldn't have wasted
you couldn't have wasted
she couldn't have wasted
we couldn't have wasted
you couldn't have wasted
they couldn't have wasted	I couldn't have been wasting
you couldn't have been wasting
she couldn't have been wasting
we couldn't have been wasting
you couldn't have been wasting
they couldn't 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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couldn't I waste?
couldn't you waste?
couldn't she waste?
couldn't we waste?
couldn't you waste?
couldn't they waste? 	couldn't I be wasting?
couldn't you be wasting?
couldn't she be wasting?
couldn't we be wasting?
couldn't you be wasting?
couldn't they be wasting? 	couldn't I have wasted?
couldn't you have wasted?
couldn't she have wasted?
couldn't we have wasted?
couldn't you have wasted?
couldn't they have wasted? 	couldn't I have been wasting?
couldn't you have been wasting?
couldn't she have been wasting?
couldn't we have been wasting?
couldn't you have been wasting?
couldn't they have been wasting?