must straddle
Regular verb: straddle - straddled- straddled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must straddle
you must straddle
he must straddle
we must straddle
you must straddle
they must straddle 	I must be straddling
you must be straddling
he must be straddling
we must be straddling
you must be straddling
they must be straddling	I must have straddled
you must have straddled
he must have straddled
we must have straddled
you must have straddled
they must have straddled	I must have been straddling
you must have been straddling
he must have been straddling
we must have been straddling
you must have been straddling
they must have been straddling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't straddle
you mustn't straddle
he mustn't straddle
we mustn't straddle
you mustn't straddle
they mustn't straddle 	I mustn't be straddling
you mustn't be straddling
he mustn't be straddling
we mustn't be straddling
you mustn't be straddling
they mustn't be straddling	I mustn't have straddled
you mustn't have straddled
he mustn't have straddled
we mustn't have straddled
you mustn't have straddled
they mustn't have straddled	I mustn't have been straddling
you mustn't have been straddling
he mustn't have been straddling
we mustn't have been straddling
you mustn't have been straddling
they mustn't have been straddling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I straddle?
must you straddle?
must he straddle?
must we straddle?
must you straddle?
must they straddle? 	must I be straddling?
must you be straddling?
must he be straddling?
must we be straddling?
must you be straddling?
must they be straddling? 	must I have straddled?
must you have straddled?
must he have straddled?
must we have straddled?
must you have straddled?
must they have straddled? 	must I have been straddling?
must you have been straddling?
must he have been straddling?
must we have been straddling?
must you have been straddling?
must they have been straddling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I straddle?
mustn't you straddle?
mustn't he straddle?
mustn't we straddle?
mustn't you straddle?
mustn't they straddle? 	mustn't I be straddling?
mustn't you be straddling?
mustn't he be straddling?
mustn't we be straddling?
mustn't you be straddling?
mustn't they be straddling? 	mustn't I have straddled?
mustn't you have straddled?
mustn't he have straddled?
mustn't we have straddled?
mustn't you have straddled?
mustn't they have straddled? 	mustn't I have been straddling?
mustn't you have been straddling?
mustn't he have been straddling?
mustn't we have been straddling?
mustn't you have been straddling?
mustn't they have been straddling?