English verb conjugation
COULD GUARANTEE

Regular verb: guarantee - guaranteed - guaranteed

Affirmation

Simple form	V-ing form
I could guarantee you could guarantee he could guarantee we could guarantee you could guarantee they could guarantee	I could be guaranteeing you could be guaranteeing he could be guaranteeing we could be guaranteeing you could be guaranteeing they could be guaranteeing
Perfect	V-ing perfect
I could have guaranteed you could have guaranteed he could have guaranteed we could have guaranteed you could have guaranteed they could have guaranteed	I could have been guaranteeing you could have been guaranteeing he could have been guaranteeing we could have been guaranteeing you could have been guaranteeing they could have been guaranteeing

Negation

Simple form	V-ing form
I could not guarantee you could not guarantee he could not guarantee we could not guarantee you could not guarantee they could not guarantee	I could not be guaranteeing you could not be guaranteeing he could not be guaranteeing we could not be guaranteeing you could not be guaranteeing they could not be guaranteeing
Perfect	V-ing perfect
I could not have guaranteed you could not have guaranteed he could not have guaranteed we could not have guaranteed you could not have guaranteed they could not have guaranteed	I could not have been guaranteeing you could not have been guaranteeing he could not have been guaranteeing we could not have been guaranteeing you could not have been guaranteeing they could not have been guaranteeing

Interrogative form

Simple form	V-ing form
could I guarantee? could you guarantee? could he guarantee? could we guarantee? could you guarantee? could they guarantee?	could I be guaranteeing? could you be guaranteeing? could he be guaranteeing? could we be guaranteeing? could you be guaranteeing? could they be guaranteeing?
Perfect	V-ing perfect
could I have guaranteed? could you have guaranteed? could he have guaranteed? could we have guaranteed? could you have guaranteed? could they have guaranteed?	could I have been guaranteeing? could you have been guaranteeing? could he have been guaranteeing? could we have been guaranteeing? could you have been guaranteeing? could they have been guaranteeing?

Interro-negative form

Simple form	V-ing form
could I not guarantee? could you not guarantee? could he not guarantee? could we not guarantee? could you not guarantee? could they not guarantee?	could I not be guaranteeing? could you not be guaranteeing? could he not be guaranteeing? could we not be guaranteeing? could you not be guaranteeing? could they not be guaranteeing?
Perfect	V-ing perfect
could I not have guaranteed? could you not have guaranteed? could he not have guaranteed? could we not have guaranteed? could you not have guaranteed? could they not have guaranteed?	could I not have been guaranteeing? could you not have been guaranteeing? could he not have been guaranteeing? could we not have been guaranteeing? could you not have been guaranteeing? could they not have been guaranteeing?