I can squeal you can squeal he can squeal we can squeal you can squeal they can squeal
V-ing form
I can be squealing you can be squealing he can be squealing we can be squealing you can be squealing they can be squealing
Perfect
I can have squealed you can have squealed he can have squealed we can have squealed you can have squealed they can have squealed
V-ing perfect
I can have been squealing you can have been squealing he can have been squealing we can have been squealing you can have been squealing they can have been squealing
Negation
Simple form
I can't squeal you can't squeal he can't squeal we can't squeal you can't squeal they can't squeal
V-ing form
I can't be squealing you can't be squealing he can't be squealing we can't be squealing you can't be squealing they can't be squealing
Perfect
I can't have squealed you can't have squealed he can't have squealed we can't have squealed you can't have squealed they can't have squealed
V-ing perfect
I can't have been squealing you can't have been squealing he can't have been squealing we can't have been squealing you can't have been squealing they can't have been squealing
Interrogative form
Simple form
can I squeal? can you squeal? can he squeal? can we squeal? can you squeal? can they squeal?
V-ing form
can I be squealing? can you be squealing? can he be squealing? can we be squealing? can you be squealing? can they be squealing?
Perfect
can I have squealed? can you have squealed? can he have squealed? can we have squealed? can you have squealed? can they have squealed?
V-ing perfect
can I have been squealing? can you have been squealing? can he have been squealing? can we have been squealing? can you have been squealing? can they have been squealing?
Interro-negative form
Simple form
can't I squeal? can't you squeal? can't he squeal? can't we squeal? can't you squeal? can't they squeal?
V-ing form
can't I be squealing? can't you be squealing? can't he be squealing? can't we be squealing? can't you be squealing? can't they be squealing?
Perfect
can't I have squealed? can't you have squealed? can't he have squealed? can't we have squealed? can't you have squealed? can't they have squealed?
V-ing perfect
can't I have been squealing? can't you have been squealing? can't he have been squealing? can't we have been squealing? can't you have been squealing? can't they have been squealing?