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 must not leap you must not leap she must not leap we must not leap you must not leap they must not leap
V-ing form
I must not be leaping you must not be leaping she must not be leaping we must not be leaping you must not be leaping they must not be leaping
Perfect
I must not have leapt, leaped you must not have leapt, leaped she must not have leapt, leaped we must not have leapt, leaped you must not have leapt, leaped they must not have leapt, leaped
V-ing perfect
I must not have been leaping you must not have been leaping she must not have been leaping we must not have been leaping you must not have been leaping they must not 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
must I not leap? must you not leap? must she not leap? must we not leap? must you not leap? must they not leap?
V-ing form
must I not be leaping? must you not be leaping? must she not be leaping? must we not be leaping? must you not be leaping? must they not be leaping?
Perfect
must I not have leapt, leaped? must you not have leapt, leaped? must she not have leapt, leaped? must we not have leapt, leaped? must you not have leapt, leaped? must they not have leapt, leaped?
V-ing perfect
must I not have been leaping? must you not have been leaping? must she not have been leaping? must we not have been leaping? must you not have been leaping? must they not have been leaping?