could foster
Regular verb: foster - fostered- fostered

Affirmation 	
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I could foster
you could foster
she could foster
we could foster
you could foster
they could foster 	I could be fostering
you could be fostering
she could be fostering
we could be fostering
you could be fostering
they could be fostering	I could have fostered
you could have fostered
she could have fostered
we could have fostered
you could have fostered
they could have fostered	I could have been fostering
you could have been fostering
she could have been fostering
we could have been fostering
you could have been fostering
they could have been fostering	

Negation 	
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I couldn't foster
you couldn't foster
she couldn't foster
we couldn't foster
you couldn't foster
they couldn't foster 	I couldn't be fostering
you couldn't be fostering
she couldn't be fostering
we couldn't be fostering
you couldn't be fostering
they couldn't be fostering	I couldn't have fostered
you couldn't have fostered
she couldn't have fostered
we couldn't have fostered
you couldn't have fostered
they couldn't have fostered	I couldn't have been fostering
you couldn't have been fostering
she couldn't have been fostering
we couldn't have been fostering
you couldn't have been fostering
they couldn't have been fostering	

Interrogative form 	
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could I foster?
could you foster?
could she foster?
could we foster?
could you foster?
could they foster? 	could I be fostering?
could you be fostering?
could she be fostering?
could we be fostering?
could you be fostering?
could they be fostering? 	could I have fostered?
could you have fostered?
could she have fostered?
could we have fostered?
could you have fostered?
could they have fostered? 	could I have been fostering?
could you have been fostering?
could she have been fostering?
could we have been fostering?
could you have been fostering?
could they have been fostering? 	

Interro-negative form 	
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couldn't I foster?
couldn't you foster?
couldn't she foster?
couldn't we foster?
couldn't you foster?
couldn't they foster? 	couldn't I be fostering?
couldn't you be fostering?
couldn't she be fostering?
couldn't we be fostering?
couldn't you be fostering?
couldn't they be fostering? 	couldn't I have fostered?
couldn't you have fostered?
couldn't she have fostered?
couldn't we have fostered?
couldn't you have fostered?
couldn't they have fostered? 	couldn't I have been fostering?
couldn't you have been fostering?
couldn't she have been fostering?
couldn't we have been fostering?
couldn't you have been fostering?
couldn't they have been fostering?