could withstand
Irregular verb: withstand - withstood- withstood

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could withstand
you could withstand
she could withstand
we could withstand
you could withstand
they could withstand 	I could be withstanding
you could be withstanding
she could be withstanding
we could be withstanding
you could be withstanding
they could be withstanding	I could have withstood
you could have withstood
she could have withstood
we could have withstood
you could have withstood
they could have withstood	I could have been withstanding
you could have been withstanding
she could have been withstanding
we could have been withstanding
you could have been withstanding
they could have been withstanding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not withstand
you could not withstand
she could not withstand
we could not withstand
you could not withstand
they could not withstand 	I could not be withstanding
you could not be withstanding
she could not be withstanding
we could not be withstanding
you could not be withstanding
they could not be withstanding	I could not have withstood
you could not have withstood
she could not have withstood
we could not have withstood
you could not have withstood
they could not have withstood	I could not have been withstanding
you could not have been withstanding
she could not have been withstanding
we could not have been withstanding
you could not have been withstanding
they could not have been withstanding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I withstand?
could you withstand?
could she withstand?
could we withstand?
could you withstand?
could they withstand? 	could I be withstanding?
could you be withstanding?
could she be withstanding?
could we be withstanding?
could you be withstanding?
could they be withstanding? 	could I have withstood?
could you have withstood?
could she have withstood?
could we have withstood?
could you have withstood?
could they have withstood? 	could I have been withstanding?
could you have been withstanding?
could she have been withstanding?
could we have been withstanding?
could you have been withstanding?
could they have been withstanding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not withstand?
could you not withstand?
could she not withstand?
could we not withstand?
could you not withstand?
could they not withstand? 	could I not be withstanding?
could you not be withstanding?
could she not be withstanding?
could we not be withstanding?
could you not be withstanding?
could they not be withstanding? 	could I not have withstood?
could you not have withstood?
could she not have withstood?
could we not have withstood?
could you not have withstood?
could they not have withstood? 	could I not have been withstanding?
could you not have been withstanding?
could she not have been withstanding?
could we not have been withstanding?
could you not have been withstanding?
could they not have been withstanding?