I must leap you must leap she must leap we must leap you must leap they must leap
V-ing form
I must be leaping you must be leaping she must be leaping we must be leaping you must be leaping they must be leaping
Perfect
I must have leapt, leaped you must have leapt, leaped she must have leapt, leaped we must have leapt, leaped you must have leapt, leaped they must have leapt, leaped
V-ing perfect
I must have been leaping you must have been leaping she must have been leaping we must have been leaping you must have been leaping they must have been leaping
Negation
Simple form
I mustn't leap you mustn't leap she mustn't leap we mustn't leap you mustn't leap they mustn't leap
V-ing form
I mustn't be leaping you mustn't be leaping she mustn't be leaping we mustn't be leaping you mustn't be leaping they mustn't be leaping
Perfect
I mustn't have leapt, leaped you mustn't have leapt, leaped she mustn't have leapt, leaped we mustn't have leapt, leaped you mustn't have leapt, leaped they mustn't have leapt, leaped
V-ing perfect
I mustn't have been leaping you mustn't have been leaping she mustn't have been leaping we mustn't have been leaping you mustn't have been leaping they mustn't have been leaping
Interrogative form
Simple form
must I leap? must you leap? must she leap? must we leap? must you leap? must they leap?
V-ing form
must I be leaping? must you be leaping? must she be leaping? must we be leaping? must you be leaping? must they be leaping?
Perfect
must I have leapt, leaped? must you have leapt, leaped? must she have leapt, leaped? must we have leapt, leaped? must you have leapt, leaped? must they have leapt, leaped?
V-ing perfect
must I have been leaping? must you have been leaping? must she have been leaping? must we have been leaping? must you have been leaping? must they have been leaping?
Interro-negative form
Simple form
mustn't I leap? mustn't you leap? mustn't she leap? mustn't we leap? mustn't you leap? mustn't they leap?
V-ing form
mustn't I be leaping? mustn't you be leaping? mustn't she be leaping? mustn't we be leaping? mustn't you be leaping? mustn't they be leaping?
Perfect
mustn't I have leapt, leaped? mustn't you have leapt, leaped? mustn't she have leapt, leaped? mustn't we have leapt, leaped? mustn't you have leapt, leaped? mustn't they have leapt, leaped?
V-ing perfect
mustn't I have been leaping? mustn't you have been leaping? mustn't she have been leaping? mustn't we have been leaping? mustn't you have been leaping? mustn't they have been leaping?