English verb conjugation
COULD CREAK

Regular verb: creak - creaked - creaked

Affirmation

Simple form	V-ing form
I could creak you could creak he could creak we could creak you could creak they could creak	I could be creaking you could be creaking he could be creaking we could be creaking you could be creaking they could be creaking
Perfect	V-ing perfect
I could have creaked you could have creaked he could have creaked we could have creaked you could have creaked they could have creaked	I could have been creaking you could have been creaking he could have been creaking we could have been creaking you could have been creaking they could have been creaking

Negation

Simple form	V-ing form
I couldn't creak you couldn't creak he couldn't creak we couldn't creak you couldn't creak they couldn't creak	I couldn't be creaking you couldn't be creaking he couldn't be creaking we couldn't be creaking you couldn't be creaking they couldn't be creaking
Perfect	V-ing perfect
I couldn't have creaked you couldn't have creaked he couldn't have creaked we couldn't have creaked you couldn't have creaked they couldn't have creaked	I couldn't have been creaking you couldn't have been creaking he couldn't have been creaking we couldn't have been creaking you couldn't have been creaking they couldn't have been creaking

Interrogative form

Simple form	V-ing form
could I creak? could you creak? could he creak? could we creak? could you creak? could they creak?	could I be creaking? could you be creaking? could he be creaking? could we be creaking? could you be creaking? could they be creaking?
Perfect	V-ing perfect
could I have creaked? could you have creaked? could he have creaked? could we have creaked? could you have creaked? could they have creaked?	could I have been creaking? could you have been creaking? could he have been creaking? could we have been creaking? could you have been creaking? could they have been creaking?

Interro-negative form

Simple form	V-ing form
couldn't I creak? couldn't you creak? couldn't he creak? couldn't we creak? couldn't you creak? couldn't they creak?	couldn't I be creaking? couldn't you be creaking? couldn't he be creaking? couldn't we be creaking? couldn't you be creaking? couldn't they be creaking?
Perfect	V-ing perfect
couldn't I have creaked? couldn't you have creaked? couldn't he have creaked? couldn't we have creaked? couldn't you have creaked? couldn't they have creaked?	couldn't I have been creaking? couldn't you have been creaking? couldn't he have been creaking? couldn't we have been creaking? couldn't you have been creaking? couldn't they have been creaking?