must window-shop
Regular verb: window-shop - window-shoped- window-shoped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must window-shop
you must window-shop
she must window-shop
we must window-shop
you must window-shop
they must window-shop 	I must be window-shoping
you must be window-shoping
she must be window-shoping
we must be window-shoping
you must be window-shoping
they must be window-shoping	I must have window-shoped
you must have window-shoped
she must have window-shoped
we must have window-shoped
you must have window-shoped
they must have window-shoped	I must have been window-shoping
you must have been window-shoping
she must have been window-shoping
we must have been window-shoping
you must have been window-shoping
they must have been window-shoping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't window-shop
you mustn't window-shop
she mustn't window-shop
we mustn't window-shop
you mustn't window-shop
they mustn't window-shop 	I mustn't be window-shoping
you mustn't be window-shoping
she mustn't be window-shoping
we mustn't be window-shoping
you mustn't be window-shoping
they mustn't be window-shoping	I mustn't have window-shoped
you mustn't have window-shoped
she mustn't have window-shoped
we mustn't have window-shoped
you mustn't have window-shoped
they mustn't have window-shoped	I mustn't have been window-shoping
you mustn't have been window-shoping
she mustn't have been window-shoping
we mustn't have been window-shoping
you mustn't have been window-shoping
they mustn't have been window-shoping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I window-shop?
must you window-shop?
must she window-shop?
must we window-shop?
must you window-shop?
must they window-shop? 	must I be window-shoping?
must you be window-shoping?
must she be window-shoping?
must we be window-shoping?
must you be window-shoping?
must they be window-shoping? 	must I have window-shoped?
must you have window-shoped?
must she have window-shoped?
must we have window-shoped?
must you have window-shoped?
must they have window-shoped? 	must I have been window-shoping?
must you have been window-shoping?
must she have been window-shoping?
must we have been window-shoping?
must you have been window-shoping?
must they have been window-shoping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I window-shop?
mustn't you window-shop?
mustn't she window-shop?
mustn't we window-shop?
mustn't you window-shop?
mustn't they window-shop? 	mustn't I be window-shoping?
mustn't you be window-shoping?
mustn't she be window-shoping?
mustn't we be window-shoping?
mustn't you be window-shoping?
mustn't they be window-shoping? 	mustn't I have window-shoped?
mustn't you have window-shoped?
mustn't she have window-shoped?
mustn't we have window-shoped?
mustn't you have window-shoped?
mustn't they have window-shoped? 	mustn't I have been window-shoping?
mustn't you have been window-shoping?
mustn't she have been window-shoping?
mustn't we have been window-shoping?
mustn't you have been window-shoping?
mustn't they have been window-shoping?