could strive
Irregular verb: strive - strived- striven

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could strive
you could strive
she could strive
we could strive
you could strive
they could strive 	I could be striving
you could be striving
she could be striving
we could be striving
you could be striving
they could be striving	I could have striven
you could have striven
she could have striven
we could have striven
you could have striven
they could have striven	I could have been striving
you could have been striving
she could have been striving
we could have been striving
you could have been striving
they could have been striving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't strive
you couldn't strive
she couldn't strive
we couldn't strive
you couldn't strive
they couldn't strive 	I couldn't be striving
you couldn't be striving
she couldn't be striving
we couldn't be striving
you couldn't be striving
they couldn't be striving	I couldn't have striven
you couldn't have striven
she couldn't have striven
we couldn't have striven
you couldn't have striven
they couldn't have striven	I couldn't have been striving
you couldn't have been striving
she couldn't have been striving
we couldn't have been striving
you couldn't have been striving
they couldn't have been striving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I strive?
could you strive?
could she strive?
could we strive?
could you strive?
could they strive? 	could I be striving?
could you be striving?
could she be striving?
could we be striving?
could you be striving?
could they be striving? 	could I have striven?
could you have striven?
could she have striven?
could we have striven?
could you have striven?
could they have striven? 	could I have been striving?
could you have been striving?
could she have been striving?
could we have been striving?
could you have been striving?
could they have been striving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I strive?
couldn't you strive?
couldn't she strive?
couldn't we strive?
couldn't you strive?
couldn't they strive? 	couldn't I be striving?
couldn't you be striving?
couldn't she be striving?
couldn't we be striving?
couldn't you be striving?
couldn't they be striving? 	couldn't I have striven?
couldn't you have striven?
couldn't she have striven?
couldn't we have striven?
couldn't you have striven?
couldn't they have striven? 	couldn't I have been striving?
couldn't you have been striving?
couldn't she have been striving?
couldn't we have been striving?
couldn't you have been striving?
couldn't they have been striving?