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 couldn't squeak you couldn't squeak he couldn't squeak we couldn't squeak you couldn't squeak they couldn't squeak
V-ing form
I couldn't be squeaking you couldn't be squeaking he couldn't be squeaking we couldn't be squeaking you couldn't be squeaking they couldn't be squeaking
Perfect
I couldn't have squeaked you couldn't have squeaked he couldn't have squeaked we couldn't have squeaked you couldn't have squeaked they couldn't have squeaked
V-ing perfect
I couldn't have been squeaking you couldn't have been squeaking he couldn't have been squeaking we couldn't have been squeaking you couldn't have been squeaking they couldn't 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
couldn't I squeak? couldn't you squeak? couldn't he squeak? couldn't we squeak? couldn't you squeak? couldn't they squeak?
V-ing form
couldn't I be squeaking? couldn't you be squeaking? couldn't he be squeaking? couldn't we be squeaking? couldn't you be squeaking? couldn't they be squeaking?
Perfect
couldn't I have squeaked? couldn't you have squeaked? couldn't he have squeaked? couldn't we have squeaked? couldn't you have squeaked? couldn't they have squeaked?
V-ing perfect
couldn't I have been squeaking? couldn't you have been squeaking? couldn't he have been squeaking? couldn't we have been squeaking? couldn't you have been squeaking? couldn't they have been squeaking?