I must float you must float she must float we must float you must float they must float
V-ing form
I must be floating you must be floating she must be floating we must be floating you must be floating they must be floating
Perfect
I must have floated you must have floated she must have floated we must have floated you must have floated they must have floated
V-ing perfect
I must have been floating you must have been floating she must have been floating we must have been floating you must have been floating they must have been floating
Negation
Simple form
I must not float you must not float she must not float we must not float you must not float they must not float
V-ing form
I must not be floating you must not be floating she must not be floating we must not be floating you must not be floating they must not be floating
Perfect
I must not have floated you must not have floated she must not have floated we must not have floated you must not have floated they must not have floated
V-ing perfect
I must not have been floating you must not have been floating she must not have been floating we must not have been floating you must not have been floating they must not have been floating
Interrogative form
Simple form
must I float? must you float? must she float? must we float? must you float? must they float?
V-ing form
must I be floating? must you be floating? must she be floating? must we be floating? must you be floating? must they be floating?
Perfect
must I have floated? must you have floated? must she have floated? must we have floated? must you have floated? must they have floated?
V-ing perfect
must I have been floating? must you have been floating? must she have been floating? must we have been floating? must you have been floating? must they have been floating?
Interro-negative form
Simple form
must I not float? must you not float? must she not float? must we not float? must you not float? must they not float?
V-ing form
must I not be floating? must you not be floating? must she not be floating? must we not be floating? must you not be floating? must they not be floating?
Perfect
must I not have floated? must you not have floated? must she not have floated? must we not have floated? must you not have floated? must they not have floated?
V-ing perfect
must I not have been floating? must you not have been floating? must she not have been floating? must we not have been floating? must you not have been floating? must they not have been floating?