I could squeak you could squeak he could squeak we could squeak you could squeak they could squeak
V-ing form
I could be squeaking you could be squeaking he could be squeaking we could be squeaking you could be squeaking they could be squeaking
Perfect
I could have squeaked you could have squeaked he could have squeaked we could have squeaked you could have squeaked they could have squeaked
V-ing perfect
I could have been squeaking you could have been squeaking he could have been squeaking we could have been squeaking you could have been squeaking they could have been squeaking
Negation
Simple form
I could not squeak you could not squeak he could not squeak we could not squeak you could not squeak they could not squeak
V-ing form
I could not be squeaking you could not be squeaking he could not be squeaking we could not be squeaking you could not be squeaking they could not be squeaking
Perfect
I could not have squeaked you could not have squeaked he could not have squeaked we could not have squeaked you could not have squeaked they could not have squeaked
V-ing perfect
I could not have been squeaking you could not have been squeaking he could not have been squeaking we could not have been squeaking you could not have been squeaking they could not have been squeaking
Interrogative form
Simple form
could I squeak? could you squeak? could he squeak? could we squeak? could you squeak? could they squeak?
V-ing form
could I be squeaking? could you be squeaking? could he be squeaking? could we be squeaking? could you be squeaking? could they be squeaking?
Perfect
could I have squeaked? could you have squeaked? could he have squeaked? could we have squeaked? could you have squeaked? could they have squeaked?
V-ing perfect
could I have been squeaking? could you have been squeaking? could he have been squeaking? could we have been squeaking? could you have been squeaking? could they have been squeaking?
Interro-negative form
Simple form
could I not squeak? could you not squeak? could he not squeak? could we not squeak? could you not squeak? could they not squeak?
V-ing form
could I not be squeaking? could you not be squeaking? could he not be squeaking? could we not be squeaking? could you not be squeaking? could they not be squeaking?
Perfect
could I not have squeaked? could you not have squeaked? could he not have squeaked? could we not have squeaked? could you not have squeaked? could they not have squeaked?
V-ing perfect
could I not have been squeaking? could you not have been squeaking? could he not have been squeaking? could we not have been squeaking? could you not have been squeaking? could they not have been squeaking?