must throttle
Regular verb: throttle - throttled- throttled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must throttle
you must throttle
she must throttle
we must throttle
you must throttle
they must throttle 	I must be throttling
you must be throttling
she must be throttling
we must be throttling
you must be throttling
they must be throttling	I must have throttled
you must have throttled
she must have throttled
we must have throttled
you must have throttled
they must have throttled	I must have been throttling
you must have been throttling
she must have been throttling
we must have been throttling
you must have been throttling
they must have been throttling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't throttle
you mustn't throttle
she mustn't throttle
we mustn't throttle
you mustn't throttle
they mustn't throttle 	I mustn't be throttling
you mustn't be throttling
she mustn't be throttling
we mustn't be throttling
you mustn't be throttling
they mustn't be throttling	I mustn't have throttled
you mustn't have throttled
she mustn't have throttled
we mustn't have throttled
you mustn't have throttled
they mustn't have throttled	I mustn't have been throttling
you mustn't have been throttling
she mustn't have been throttling
we mustn't have been throttling
you mustn't have been throttling
they mustn't have been throttling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I throttle?
must you throttle?
must she throttle?
must we throttle?
must you throttle?
must they throttle? 	must I be throttling?
must you be throttling?
must she be throttling?
must we be throttling?
must you be throttling?
must they be throttling? 	must I have throttled?
must you have throttled?
must she have throttled?
must we have throttled?
must you have throttled?
must they have throttled? 	must I have been throttling?
must you have been throttling?
must she have been throttling?
must we have been throttling?
must you have been throttling?
must they have been throttling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I throttle?
mustn't you throttle?
mustn't she throttle?
mustn't we throttle?
mustn't you throttle?
mustn't they throttle? 	mustn't I be throttling?
mustn't you be throttling?
mustn't she be throttling?
mustn't we be throttling?
mustn't you be throttling?
mustn't they be throttling? 	mustn't I have throttled?
mustn't you have throttled?
mustn't she have throttled?
mustn't we have throttled?
mustn't you have throttled?
mustn't they have throttled? 	mustn't I have been throttling?
mustn't you have been throttling?
mustn't she have been throttling?
mustn't we have been throttling?
mustn't you have been throttling?
mustn't they have been throttling?