could stipulate
Regular verb: stipulate - stipulated- stipulated

Affirmation 	
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I could stipulate
you could stipulate
she could stipulate
we could stipulate
you could stipulate
they could stipulate 	I could be stipulating
you could be stipulating
she could be stipulating
we could be stipulating
you could be stipulating
they could be stipulating	I could have stipulated
you could have stipulated
she could have stipulated
we could have stipulated
you could have stipulated
they could have stipulated	I could have been stipulating
you could have been stipulating
she could have been stipulating
we could have been stipulating
you could have been stipulating
they could have been stipulating	

Negation 	
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I couldn't stipulate
you couldn't stipulate
she couldn't stipulate
we couldn't stipulate
you couldn't stipulate
they couldn't stipulate 	I couldn't be stipulating
you couldn't be stipulating
she couldn't be stipulating
we couldn't be stipulating
you couldn't be stipulating
they couldn't be stipulating	I couldn't have stipulated
you couldn't have stipulated
she couldn't have stipulated
we couldn't have stipulated
you couldn't have stipulated
they couldn't have stipulated	I couldn't have been stipulating
you couldn't have been stipulating
she couldn't have been stipulating
we couldn't have been stipulating
you couldn't have been stipulating
they couldn't have been stipulating	

Interrogative form 	
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could I stipulate?
could you stipulate?
could she stipulate?
could we stipulate?
could you stipulate?
could they stipulate? 	could I be stipulating?
could you be stipulating?
could she be stipulating?
could we be stipulating?
could you be stipulating?
could they be stipulating? 	could I have stipulated?
could you have stipulated?
could she have stipulated?
could we have stipulated?
could you have stipulated?
could they have stipulated? 	could I have been stipulating?
could you have been stipulating?
could she have been stipulating?
could we have been stipulating?
could you have been stipulating?
could they have been stipulating? 	

Interro-negative form 	
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couldn't I stipulate?
couldn't you stipulate?
couldn't she stipulate?
couldn't we stipulate?
couldn't you stipulate?
couldn't they stipulate? 	couldn't I be stipulating?
couldn't you be stipulating?
couldn't she be stipulating?
couldn't we be stipulating?
couldn't you be stipulating?
couldn't they be stipulating? 	couldn't I have stipulated?
couldn't you have stipulated?
couldn't she have stipulated?
couldn't we have stipulated?
couldn't you have stipulated?
couldn't they have stipulated? 	couldn't I have been stipulating?
couldn't you have been stipulating?
couldn't she have been stipulating?
couldn't we have been stipulating?
couldn't you have been stipulating?
couldn't they have been stipulating?