I must twinkle you must twinkle he must twinkle we must twinkle you must twinkle they must twinkle
V-ing form
I must be twinkling you must be twinkling he must be twinkling we must be twinkling you must be twinkling they must be twinkling
Perfect
I must have twinkled you must have twinkled he must have twinkled we must have twinkled you must have twinkled they must have twinkled
V-ing perfect
I must have been twinkling you must have been twinkling he must have been twinkling we must have been twinkling you must have been twinkling they must have been twinkling
Negation
Simple form
I must not twinkle you must not twinkle he must not twinkle we must not twinkle you must not twinkle they must not twinkle
V-ing form
I must not be twinkling you must not be twinkling he must not be twinkling we must not be twinkling you must not be twinkling they must not be twinkling
Perfect
I must not have twinkled you must not have twinkled he must not have twinkled we must not have twinkled you must not have twinkled they must not have twinkled
V-ing perfect
I must not have been twinkling you must not have been twinkling he must not have been twinkling we must not have been twinkling you must not have been twinkling they must not have been twinkling
Interrogative form
Simple form
must I twinkle? must you twinkle? must he twinkle? must we twinkle? must you twinkle? must they twinkle?
V-ing form
must I be twinkling? must you be twinkling? must he be twinkling? must we be twinkling? must you be twinkling? must they be twinkling?
Perfect
must I have twinkled? must you have twinkled? must he have twinkled? must we have twinkled? must you have twinkled? must they have twinkled?
V-ing perfect
must I have been twinkling? must you have been twinkling? must he have been twinkling? must we have been twinkling? must you have been twinkling? must they have been twinkling?
Interro-negative form
Simple form
must I not twinkle? must you not twinkle? must he not twinkle? must we not twinkle? must you not twinkle? must they not twinkle?
V-ing form
must I not be twinkling? must you not be twinkling? must he not be twinkling? must we not be twinkling? must you not be twinkling? must they not be twinkling?
Perfect
must I not have twinkled? must you not have twinkled? must he not have twinkled? must we not have twinkled? must you not have twinkled? must they not have twinkled?
V-ing perfect
must I not have been twinkling? must you not have been twinkling? must he not have been twinkling? must we not have been twinkling? must you not have been twinkling? must they not have been twinkling?