must obtrude
Regular verb: obtrude - obtruded- obtruded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must obtrude
you must obtrude
he must obtrude
we must obtrude
you must obtrude
they must obtrude 	I must be obtruding
you must be obtruding
he must be obtruding
we must be obtruding
you must be obtruding
they must be obtruding	I must have obtruded
you must have obtruded
he must have obtruded
we must have obtruded
you must have obtruded
they must have obtruded	I must have been obtruding
you must have been obtruding
he must have been obtruding
we must have been obtruding
you must have been obtruding
they must have been obtruding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't obtrude
you mustn't obtrude
he mustn't obtrude
we mustn't obtrude
you mustn't obtrude
they mustn't obtrude 	I mustn't be obtruding
you mustn't be obtruding
he mustn't be obtruding
we mustn't be obtruding
you mustn't be obtruding
they mustn't be obtruding	I mustn't have obtruded
you mustn't have obtruded
he mustn't have obtruded
we mustn't have obtruded
you mustn't have obtruded
they mustn't have obtruded	I mustn't have been obtruding
you mustn't have been obtruding
he mustn't have been obtruding
we mustn't have been obtruding
you mustn't have been obtruding
they mustn't have been obtruding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I obtrude?
must you obtrude?
must he obtrude?
must we obtrude?
must you obtrude?
must they obtrude? 	must I be obtruding?
must you be obtruding?
must he be obtruding?
must we be obtruding?
must you be obtruding?
must they be obtruding? 	must I have obtruded?
must you have obtruded?
must he have obtruded?
must we have obtruded?
must you have obtruded?
must they have obtruded? 	must I have been obtruding?
must you have been obtruding?
must he have been obtruding?
must we have been obtruding?
must you have been obtruding?
must they have been obtruding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I obtrude?
mustn't you obtrude?
mustn't he obtrude?
mustn't we obtrude?
mustn't you obtrude?
mustn't they obtrude? 	mustn't I be obtruding?
mustn't you be obtruding?
mustn't he be obtruding?
mustn't we be obtruding?
mustn't you be obtruding?
mustn't they be obtruding? 	mustn't I have obtruded?
mustn't you have obtruded?
mustn't he have obtruded?
mustn't we have obtruded?
mustn't you have obtruded?
mustn't they have obtruded? 	mustn't I have been obtruding?
mustn't you have been obtruding?
mustn't he have been obtruding?
mustn't we have been obtruding?
mustn't you have been obtruding?
mustn't they have been obtruding?