I must bethink you must bethink he must bethink we must bethink you must bethink they must bethink
V-ing form
I must be bethinking you must be bethinking he must be bethinking we must be bethinking you must be bethinking they must be bethinking
Perfect
I must have bethought you must have bethought he must have bethought we must have bethought you must have bethought they must have bethought
V-ing perfect
I must have been bethinking you must have been bethinking he must have been bethinking we must have been bethinking you must have been bethinking they must have been bethinking
Negation
Simple form
I must not bethink you must not bethink he must not bethink we must not bethink you must not bethink they must not bethink
V-ing form
I must not be bethinking you must not be bethinking he must not be bethinking we must not be bethinking you must not be bethinking they must not be bethinking
Perfect
I must not have bethought you must not have bethought he must not have bethought we must not have bethought you must not have bethought they must not have bethought
V-ing perfect
I must not have been bethinking you must not have been bethinking he must not have been bethinking we must not have been bethinking you must not have been bethinking they must not have been bethinking
Interrogative form
Simple form
must I bethink? must you bethink? must he bethink? must we bethink? must you bethink? must they bethink?
V-ing form
must I be bethinking? must you be bethinking? must he be bethinking? must we be bethinking? must you be bethinking? must they be bethinking?
Perfect
must I have bethought? must you have bethought? must he have bethought? must we have bethought? must you have bethought? must they have bethought?
V-ing perfect
must I have been bethinking? must you have been bethinking? must he have been bethinking? must we have been bethinking? must you have been bethinking? must they have been bethinking?
Interro-negative form
Simple form
must I not bethink? must you not bethink? must he not bethink? must we not bethink? must you not bethink? must they not bethink?
V-ing form
must I not be bethinking? must you not be bethinking? must he not be bethinking? must we not be bethinking? must you not be bethinking? must they not be bethinking?
Perfect
must I not have bethought? must you not have bethought? must he not have bethought? must we not have bethought? must you not have bethought? must they not have bethought?
V-ing perfect
must I not have been bethinking? must you not have been bethinking? must he not have been bethinking? must we not have been bethinking? must you not have been bethinking? must they not have been bethinking?