could string
Irregular verb: string - strung- strung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could string
you could string
he could string
we could string
you could string
they could string 	I could be stringing
you could be stringing
he could be stringing
we could be stringing
you could be stringing
they could be stringing	I could have strung
you could have strung
he could have strung
we could have strung
you could have strung
they could have strung	I could have been stringing
you could have been stringing
he could have been stringing
we could have been stringing
you could have been stringing
they could have been stringing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not string
you could not string
he could not string
we could not string
you could not string
they could not string 	I could not be stringing
you could not be stringing
he could not be stringing
we could not be stringing
you could not be stringing
they could not be stringing	I could not have strung
you could not have strung
he could not have strung
we could not have strung
you could not have strung
they could not have strung	I could not have been stringing
you could not have been stringing
he could not have been stringing
we could not have been stringing
you could not have been stringing
they could not have been stringing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I string?
could you string?
could he string?
could we string?
could you string?
could they string? 	could I be stringing?
could you be stringing?
could he be stringing?
could we be stringing?
could you be stringing?
could they be stringing? 	could I have strung?
could you have strung?
could he have strung?
could we have strung?
could you have strung?
could they have strung? 	could I have been stringing?
could you have been stringing?
could he have been stringing?
could we have been stringing?
could you have been stringing?
could they have been stringing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not string?
could you not string?
could he not string?
could we not string?
could you not string?
could they not string? 	could I not be stringing?
could you not be stringing?
could he not be stringing?
could we not be stringing?
could you not be stringing?
could they not be stringing? 	could I not have strung?
could you not have strung?
could he not have strung?
could we not have strung?
could you not have strung?
could they not have strung? 	could I not have been stringing?
could you not have been stringing?
could he not have been stringing?
could we not have been stringing?
could you not have been stringing?
could they not have been stringing?