must deconcentrate
Regular verb: deconcentrate - deconcentrated- deconcentrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must deconcentrate
you must deconcentrate
he must deconcentrate
we must deconcentrate
you must deconcentrate
they must deconcentrate 	I must be deconcentrating
you must be deconcentrating
he must be deconcentrating
we must be deconcentrating
you must be deconcentrating
they must be deconcentrating	I must have deconcentrated
you must have deconcentrated
he must have deconcentrated
we must have deconcentrated
you must have deconcentrated
they must have deconcentrated	I must have been deconcentrating
you must have been deconcentrating
he must have been deconcentrating
we must have been deconcentrating
you must have been deconcentrating
they must have been deconcentrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not deconcentrate
you must not deconcentrate
he must not deconcentrate
we must not deconcentrate
you must not deconcentrate
they must not deconcentrate 	I must not be deconcentrating
you must not be deconcentrating
he must not be deconcentrating
we must not be deconcentrating
you must not be deconcentrating
they must not be deconcentrating	I must not have deconcentrated
you must not have deconcentrated
he must not have deconcentrated
we must not have deconcentrated
you must not have deconcentrated
they must not have deconcentrated	I must not have been deconcentrating
you must not have been deconcentrating
he must not have been deconcentrating
we must not have been deconcentrating
you must not have been deconcentrating
they must not have been deconcentrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I deconcentrate?
must you deconcentrate?
must he deconcentrate?
must we deconcentrate?
must you deconcentrate?
must they deconcentrate? 	must I be deconcentrating?
must you be deconcentrating?
must he be deconcentrating?
must we be deconcentrating?
must you be deconcentrating?
must they be deconcentrating? 	must I have deconcentrated?
must you have deconcentrated?
must he have deconcentrated?
must we have deconcentrated?
must you have deconcentrated?
must they have deconcentrated? 	must I have been deconcentrating?
must you have been deconcentrating?
must he have been deconcentrating?
must we have been deconcentrating?
must you have been deconcentrating?
must they have been deconcentrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not deconcentrate?
must you not deconcentrate?
must he not deconcentrate?
must we not deconcentrate?
must you not deconcentrate?
must they not deconcentrate? 	must I not be deconcentrating?
must you not be deconcentrating?
must he not be deconcentrating?
must we not be deconcentrating?
must you not be deconcentrating?
must they not be deconcentrating? 	must I not have deconcentrated?
must you not have deconcentrated?
must he not have deconcentrated?
must we not have deconcentrated?
must you not have deconcentrated?
must they not have deconcentrated? 	must I not have been deconcentrating?
must you not have been deconcentrating?
must he not have been deconcentrating?
must we not have been deconcentrating?
must you not have been deconcentrating?
must they not have been deconcentrating?