I must groove you must groove she must groove we must groove you must groove they must groove
V-ing form
I must be grooving you must be grooving she must be grooving we must be grooving you must be grooving they must be grooving
Perfect
I must have grooved you must have grooved she 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 she 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 she 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 she 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 she 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 she 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 she groove? must we groove? must you groove? must they groove?
V-ing form
must I be grooving? must you be grooving? must she be grooving? must we be grooving? must you be grooving? must they be grooving?
Perfect
must I have grooved? must you have grooved? must she 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 she 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 she 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 she 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 she 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 she have been grooving? mustn't we have been grooving? mustn't you have been grooving? mustn't they have been grooving?