could tease
Regular verb: tease - teased- teased

Affirmation 	
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I could tease
you could tease
he could tease
we could tease
you could tease
they could tease 	I could be teasing
you could be teasing
he could be teasing
we could be teasing
you could be teasing
they could be teasing	I could have teased
you could have teased
he could have teased
we could have teased
you could have teased
they could have teased	I could have been teasing
you could have been teasing
he could have been teasing
we could have been teasing
you could have been teasing
they could have been teasing	

Negation 	
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I couldn't tease
you couldn't tease
he couldn't tease
we couldn't tease
you couldn't tease
they couldn't tease 	I couldn't be teasing
you couldn't be teasing
he couldn't be teasing
we couldn't be teasing
you couldn't be teasing
they couldn't be teasing	I couldn't have teased
you couldn't have teased
he couldn't have teased
we couldn't have teased
you couldn't have teased
they couldn't have teased	I couldn't have been teasing
you couldn't have been teasing
he couldn't have been teasing
we couldn't have been teasing
you couldn't have been teasing
they couldn't have been teasing	

Interrogative form 	
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could I tease?
could you tease?
could he tease?
could we tease?
could you tease?
could they tease? 	could I be teasing?
could you be teasing?
could he be teasing?
could we be teasing?
could you be teasing?
could they be teasing? 	could I have teased?
could you have teased?
could he have teased?
could we have teased?
could you have teased?
could they have teased? 	could I have been teasing?
could you have been teasing?
could he have been teasing?
could we have been teasing?
could you have been teasing?
could they have been teasing? 	

Interro-negative form 	
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couldn't I tease?
couldn't you tease?
couldn't he tease?
couldn't we tease?
couldn't you tease?
couldn't they tease? 	couldn't I be teasing?
couldn't you be teasing?
couldn't he be teasing?
couldn't we be teasing?
couldn't you be teasing?
couldn't they be teasing? 	couldn't I have teased?
couldn't you have teased?
couldn't he have teased?
couldn't we have teased?
couldn't you have teased?
couldn't they have teased? 	couldn't I have been teasing?
couldn't you have been teasing?
couldn't he have been teasing?
couldn't we have been teasing?
couldn't you have been teasing?
couldn't they have been teasing?