must abandon
Regular verb: abandon - abandoned- abandoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must abandon
you must abandon
she must abandon
we must abandon
you must abandon
they must abandon 	I must be abandoning
you must be abandoning
she must be abandoning
we must be abandoning
you must be abandoning
they must be abandoning	I must have abandoned
you must have abandoned
she must have abandoned
we must have abandoned
you must have abandoned
they must have abandoned	I must have been abandoning
you must have been abandoning
she must have been abandoning
we must have been abandoning
you must have been abandoning
they must have been abandoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't abandon
you mustn't abandon
she mustn't abandon
we mustn't abandon
you mustn't abandon
they mustn't abandon 	I mustn't be abandoning
you mustn't be abandoning
she mustn't be abandoning
we mustn't be abandoning
you mustn't be abandoning
they mustn't be abandoning	I mustn't have abandoned
you mustn't have abandoned
she mustn't have abandoned
we mustn't have abandoned
you mustn't have abandoned
they mustn't have abandoned	I mustn't have been abandoning
you mustn't have been abandoning
she mustn't have been abandoning
we mustn't have been abandoning
you mustn't have been abandoning
they mustn't have been abandoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I abandon?
must you abandon?
must she abandon?
must we abandon?
must you abandon?
must they abandon? 	must I be abandoning?
must you be abandoning?
must she be abandoning?
must we be abandoning?
must you be abandoning?
must they be abandoning? 	must I have abandoned?
must you have abandoned?
must she have abandoned?
must we have abandoned?
must you have abandoned?
must they have abandoned? 	must I have been abandoning?
must you have been abandoning?
must she have been abandoning?
must we have been abandoning?
must you have been abandoning?
must they have been abandoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I abandon?
mustn't you abandon?
mustn't she abandon?
mustn't we abandon?
mustn't you abandon?
mustn't they abandon? 	mustn't I be abandoning?
mustn't you be abandoning?
mustn't she be abandoning?
mustn't we be abandoning?
mustn't you be abandoning?
mustn't they be abandoning? 	mustn't I have abandoned?
mustn't you have abandoned?
mustn't she have abandoned?
mustn't we have abandoned?
mustn't you have abandoned?
mustn't they have abandoned? 	mustn't I have been abandoning?
mustn't you have been abandoning?
mustn't she have been abandoning?
mustn't we have been abandoning?
mustn't you have been abandoning?
mustn't they have been abandoning?