I must fumble you must fumble he must fumble we must fumble you must fumble they must fumble
V-ing form
I must be fumbling you must be fumbling he must be fumbling we must be fumbling you must be fumbling they must be fumbling
Perfect
I must have fumbled you must have fumbled he must have fumbled we must have fumbled you must have fumbled they must have fumbled
V-ing perfect
I must have been fumbling you must have been fumbling he must have been fumbling we must have been fumbling you must have been fumbling they must have been fumbling
Negation
Simple form
I must not fumble you must not fumble he must not fumble we must not fumble you must not fumble they must not fumble
V-ing form
I must not be fumbling you must not be fumbling he must not be fumbling we must not be fumbling you must not be fumbling they must not be fumbling
Perfect
I must not have fumbled you must not have fumbled he must not have fumbled we must not have fumbled you must not have fumbled they must not have fumbled
V-ing perfect
I must not have been fumbling you must not have been fumbling he must not have been fumbling we must not have been fumbling you must not have been fumbling they must not have been fumbling
Interrogative form
Simple form
must I fumble? must you fumble? must he fumble? must we fumble? must you fumble? must they fumble?
V-ing form
must I be fumbling? must you be fumbling? must he be fumbling? must we be fumbling? must you be fumbling? must they be fumbling?
Perfect
must I have fumbled? must you have fumbled? must he have fumbled? must we have fumbled? must you have fumbled? must they have fumbled?
V-ing perfect
must I have been fumbling? must you have been fumbling? must he have been fumbling? must we have been fumbling? must you have been fumbling? must they have been fumbling?
Interro-negative form
Simple form
must I not fumble? must you not fumble? must he not fumble? must we not fumble? must you not fumble? must they not fumble?
V-ing form
must I not be fumbling? must you not be fumbling? must he not be fumbling? must we not be fumbling? must you not be fumbling? must they not be fumbling?
Perfect
must I not have fumbled? must you not have fumbled? must he not have fumbled? must we not have fumbled? must you not have fumbled? must they not have fumbled?
V-ing perfect
must I not have been fumbling? must you not have been fumbling? must he not have been fumbling? must we not have been fumbling? must you not have been fumbling? must they not have been fumbling?