English verb conjugation
COULD WITHSTAND

Irregular verb: withstand - withstood - withstood

Affirmation

Simple form	V-ing form
I could withstand you could withstand he could withstand we could withstand you could withstand they could withstand	I could be withstanding you could be withstanding he could be withstanding we could be withstanding you could be withstanding they could be withstanding
Perfect	V-ing perfect
I could have withstood you could have withstood he 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 he 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
I couldn't withstand you couldn't withstand he couldn't withstand we couldn't withstand you couldn't withstand they couldn't withstand	I couldn't be withstanding you couldn't be withstanding he couldn't be withstanding we couldn't be withstanding you couldn't be withstanding they couldn't be withstanding
Perfect	V-ing perfect
I couldn't have withstood you couldn't have withstood he couldn't have withstood we couldn't have withstood you couldn't have withstood they couldn't have withstood	I couldn't have been withstanding you couldn't have been withstanding he couldn't have been withstanding we couldn't have been withstanding you couldn't have been withstanding they couldn't have been withstanding

Interrogative form

Simple form	V-ing form
could I withstand? could you withstand? could he withstand? could we withstand? could you withstand? could they withstand?	could I be withstanding? could you be withstanding? could he be withstanding? could we be withstanding? could you be withstanding? could they be withstanding?
Perfect	V-ing perfect
could I have withstood? could you have withstood? could he 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 he 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
couldn't I withstand? couldn't you withstand? couldn't he withstand? couldn't we withstand? couldn't you withstand? couldn't they withstand?	couldn't I be withstanding? couldn't you be withstanding? couldn't he be withstanding? couldn't we be withstanding? couldn't you be withstanding? couldn't they be withstanding?
Perfect	V-ing perfect
couldn't I have withstood? couldn't you have withstood? couldn't he have withstood? couldn't we have withstood? couldn't you have withstood? couldn't they have withstood?	couldn't I have been withstanding? couldn't you have been withstanding? couldn't he have been withstanding? couldn't we have been withstanding? couldn't you have been withstanding? couldn't they have been withstanding?