I must groove you must groove he must groove we must groove you must groove they must groove
V-ing form
I must be grooving you must be grooving he must be grooving we must be grooving you must be grooving they must be grooving
Perfect
I must have grooved you must have grooved he must have grooved we must have grooved you must have grooved they must have grooved
V-ing perfect
I must have been grooving you must have been grooving he must have been grooving we must have been grooving you must have been grooving they must have been grooving
Negation
Simple form
I mustn't groove you mustn't groove he mustn't groove we mustn't groove you mustn't groove they mustn't groove
V-ing form
I mustn't be grooving you mustn't be grooving he mustn't be grooving we mustn't be grooving you mustn't be grooving they mustn't be grooving
Perfect
I mustn't have grooved you mustn't have grooved he mustn't have grooved we mustn't have grooved you mustn't have grooved they mustn't have grooved
V-ing perfect
I mustn't have been grooving you mustn't have been grooving he mustn't have been grooving we mustn't have been grooving you mustn't have been grooving they mustn't have been grooving
Interrogative form
Simple form
must I groove? must you groove? must he groove? must we groove? must you groove? must they groove?
V-ing form
must I be grooving? must you be grooving? must he be grooving? must we be grooving? must you be grooving? must they be grooving?
Perfect
must I have grooved? must you have grooved? must he have grooved? must we have grooved? must you have grooved? must they have grooved?
V-ing perfect
must I have been grooving? must you have been grooving? must he have been grooving? must we have been grooving? must you have been grooving? must they have been grooving?
Interro-negative form
Simple form
mustn't I groove? mustn't you groove? mustn't he groove? mustn't we groove? mustn't you groove? mustn't they groove?
V-ing form
mustn't I be grooving? mustn't you be grooving? mustn't he be grooving? mustn't we be grooving? mustn't you be grooving? mustn't they be grooving?
Perfect
mustn't I have grooved? mustn't you have grooved? mustn't he have grooved? mustn't we have grooved? mustn't you have grooved? mustn't they have grooved?
V-ing perfect
mustn't I have been grooving? mustn't you have been grooving? mustn't he have been grooving? mustn't we have been grooving? mustn't you have been grooving? mustn't they have been grooving?