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 couldn't guarantee you couldn't guarantee he couldn't guarantee we couldn't guarantee you couldn't guarantee they couldn't guarantee	I couldn't be guaranteeing you couldn't be guaranteeing he couldn't be guaranteeing we couldn't be guaranteeing you couldn't be guaranteeing they couldn't be guaranteeing
Perfect	V-ing perfect
I couldn't have guaranteed you couldn't have guaranteed he couldn't have guaranteed we couldn't have guaranteed you couldn't have guaranteed they couldn't have guaranteed	I couldn't have been guaranteeing you couldn't have been guaranteeing he couldn't have been guaranteeing we couldn't have been guaranteeing you couldn't have been guaranteeing they couldn't 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
couldn't I guarantee? couldn't you guarantee? couldn't he guarantee? couldn't we guarantee? couldn't you guarantee? couldn't they guarantee?	couldn't I be guaranteeing? couldn't you be guaranteeing? couldn't he be guaranteeing? couldn't we be guaranteeing? couldn't you be guaranteeing? couldn't they be guaranteeing?
Perfect	V-ing perfect
couldn't I have guaranteed? couldn't you have guaranteed? couldn't he have guaranteed? couldn't we have guaranteed? couldn't you have guaranteed? couldn't they have guaranteed?	couldn't I have been guaranteeing? couldn't you have been guaranteeing? couldn't he have been guaranteeing? couldn't we have been guaranteeing? couldn't you have been guaranteeing? couldn't they have been guaranteeing?