could founder
Regular verb: founder - foundered- foundered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could founder
you could founder
he could founder
we could founder
you could founder
they could founder 	I could be foundering
you could be foundering
he could be foundering
we could be foundering
you could be foundering
they could be foundering	I could have foundered
you could have foundered
he could have foundered
we could have foundered
you could have foundered
they could have foundered	I could have been foundering
you could have been foundering
he could have been foundering
we could have been foundering
you could have been foundering
they could have been foundering	

Negation 	
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I could not founder
you could not founder
he could not founder
we could not founder
you could not founder
they could not founder 	I could not be foundering
you could not be foundering
he could not be foundering
we could not be foundering
you could not be foundering
they could not be foundering	I could not have foundered
you could not have foundered
he could not have foundered
we could not have foundered
you could not have foundered
they could not have foundered	I could not have been foundering
you could not have been foundering
he could not have been foundering
we could not have been foundering
you could not have been foundering
they could not have been foundering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I founder?
could you founder?
could he founder?
could we founder?
could you founder?
could they founder? 	could I be foundering?
could you be foundering?
could he be foundering?
could we be foundering?
could you be foundering?
could they be foundering? 	could I have foundered?
could you have foundered?
could he have foundered?
could we have foundered?
could you have foundered?
could they have foundered? 	could I have been foundering?
could you have been foundering?
could he have been foundering?
could we have been foundering?
could you have been foundering?
could they have been foundering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not founder?
could you not founder?
could he not founder?
could we not founder?
could you not founder?
could they not founder? 	could I not be foundering?
could you not be foundering?
could he not be foundering?
could we not be foundering?
could you not be foundering?
could they not be foundering? 	could I not have foundered?
could you not have foundered?
could he not have foundered?
could we not have foundered?
could you not have foundered?
could they not have foundered? 	could I not have been foundering?
could you not have been foundering?
could he not have been foundering?
could we not have been foundering?
could you not have been foundering?
could they not have been foundering?