I can rethink you can rethink he can rethink we can rethink you can rethink they can rethink
V-ing form
I can be rethinking you can be rethinking he can be rethinking we can be rethinking you can be rethinking they can be rethinking
Perfect
I can have rethought you can have rethought he can have rethought we can have rethought you can have rethought they can have rethought
V-ing perfect
I can have been rethinking you can have been rethinking he can have been rethinking we can have been rethinking you can have been rethinking they can have been rethinking
Negation
Simple form
I cannot rethink you cannot rethink he cannot rethink we cannot rethink you cannot rethink they cannot rethink
V-ing form
I cannot be rethinking you cannot be rethinking he cannot be rethinking we cannot be rethinking you cannot be rethinking they cannot be rethinking
Perfect
I cannot have rethought you cannot have rethought he cannot have rethought we cannot have rethought you cannot have rethought they cannot have rethought
V-ing perfect
I cannot have been rethinking you cannot have been rethinking he cannot have been rethinking we cannot have been rethinking you cannot have been rethinking they cannot have been rethinking
Interrogative form
Simple form
can I rethink? can you rethink? can he rethink? can we rethink? can you rethink? can they rethink?
V-ing form
can I be rethinking? can you be rethinking? can he be rethinking? can we be rethinking? can you be rethinking? can they be rethinking?
Perfect
can I have rethought? can you have rethought? can he have rethought? can we have rethought? can you have rethought? can they have rethought?
V-ing perfect
can I have been rethinking? can you have been rethinking? can he have been rethinking? can we have been rethinking? can you have been rethinking? can they have been rethinking?
Interro-negative form
Simple form
can I not rethink? can you not rethink? can he not rethink? can we not rethink? can you not rethink? can they not rethink?
V-ing form
can I not be rethinking? can you not be rethinking? can he not be rethinking? can we not be rethinking? can you not be rethinking? can they not be rethinking?
Perfect
can I not have rethought? can you not have rethought? can he not have rethought? can we not have rethought? can you not have rethought? can they not have rethought?
V-ing perfect
can I not have been rethinking? can you not have been rethinking? can he not have been rethinking? can we not have been rethinking? can you not have been rethinking? can they not have been rethinking?