must shuttle
Regular verb: shuttle - shuttled- shuttled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shuttle
you must shuttle
she must shuttle
we must shuttle
you must shuttle
they must shuttle 	I must be shuttling
you must be shuttling
she must be shuttling
we must be shuttling
you must be shuttling
they must be shuttling	I must have shuttled
you must have shuttled
she must have shuttled
we must have shuttled
you must have shuttled
they must have shuttled	I must have been shuttling
you must have been shuttling
she must have been shuttling
we must have been shuttling
you must have been shuttling
they must have been shuttling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't shuttle
you mustn't shuttle
she mustn't shuttle
we mustn't shuttle
you mustn't shuttle
they mustn't shuttle 	I mustn't be shuttling
you mustn't be shuttling
she mustn't be shuttling
we mustn't be shuttling
you mustn't be shuttling
they mustn't be shuttling	I mustn't have shuttled
you mustn't have shuttled
she mustn't have shuttled
we mustn't have shuttled
you mustn't have shuttled
they mustn't have shuttled	I mustn't have been shuttling
you mustn't have been shuttling
she mustn't have been shuttling
we mustn't have been shuttling
you mustn't have been shuttling
they mustn't have been shuttling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shuttle?
must you shuttle?
must she shuttle?
must we shuttle?
must you shuttle?
must they shuttle? 	must I be shuttling?
must you be shuttling?
must she be shuttling?
must we be shuttling?
must you be shuttling?
must they be shuttling? 	must I have shuttled?
must you have shuttled?
must she have shuttled?
must we have shuttled?
must you have shuttled?
must they have shuttled? 	must I have been shuttling?
must you have been shuttling?
must she have been shuttling?
must we have been shuttling?
must you have been shuttling?
must they have been shuttling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I shuttle?
mustn't you shuttle?
mustn't she shuttle?
mustn't we shuttle?
mustn't you shuttle?
mustn't they shuttle? 	mustn't I be shuttling?
mustn't you be shuttling?
mustn't she be shuttling?
mustn't we be shuttling?
mustn't you be shuttling?
mustn't they be shuttling? 	mustn't I have shuttled?
mustn't you have shuttled?
mustn't she have shuttled?
mustn't we have shuttled?
mustn't you have shuttled?
mustn't they have shuttled? 	mustn't I have been shuttling?
mustn't you have been shuttling?
mustn't she have been shuttling?
mustn't we have been shuttling?
mustn't you have been shuttling?
mustn't they have been shuttling?