must forefend
Regular verb: forefend - forefended- forefended

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must forefend
you must forefend
she must forefend
we must forefend
you must forefend
they must forefend 	I must be forefending
you must be forefending
she must be forefending
we must be forefending
you must be forefending
they must be forefending	I must have forefended
you must have forefended
she must have forefended
we must have forefended
you must have forefended
they must have forefended	I must have been forefending
you must have been forefending
she must have been forefending
we must have been forefending
you must have been forefending
they must have been forefending	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't forefend
you mustn't forefend
she mustn't forefend
we mustn't forefend
you mustn't forefend
they mustn't forefend 	I mustn't be forefending
you mustn't be forefending
she mustn't be forefending
we mustn't be forefending
you mustn't be forefending
they mustn't be forefending	I mustn't have forefended
you mustn't have forefended
she mustn't have forefended
we mustn't have forefended
you mustn't have forefended
they mustn't have forefended	I mustn't have been forefending
you mustn't have been forefending
she mustn't have been forefending
we mustn't have been forefending
you mustn't have been forefending
they mustn't have been forefending	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I forefend?
must you forefend?
must she forefend?
must we forefend?
must you forefend?
must they forefend? 	must I be forefending?
must you be forefending?
must she be forefending?
must we be forefending?
must you be forefending?
must they be forefending? 	must I have forefended?
must you have forefended?
must she have forefended?
must we have forefended?
must you have forefended?
must they have forefended? 	must I have been forefending?
must you have been forefending?
must she have been forefending?
must we have been forefending?
must you have been forefending?
must they have been forefending? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I forefend?
mustn't you forefend?
mustn't she forefend?
mustn't we forefend?
mustn't you forefend?
mustn't they forefend? 	mustn't I be forefending?
mustn't you be forefending?
mustn't she be forefending?
mustn't we be forefending?
mustn't you be forefending?
mustn't they be forefending? 	mustn't I have forefended?
mustn't you have forefended?
mustn't she have forefended?
mustn't we have forefended?
mustn't you have forefended?
mustn't they have forefended? 	mustn't I have been forefending?
mustn't you have been forefending?
mustn't she have been forefending?
mustn't we have been forefending?
mustn't you have been forefending?
mustn't they have been forefending?