I must fiddle you must fiddle he must fiddle we must fiddle you must fiddle they must fiddle
V-ing form
I must be fiddling you must be fiddling he must be fiddling we must be fiddling you must be fiddling they must be fiddling
Perfect
I must have fiddled you must have fiddled he must have fiddled we must have fiddled you must have fiddled they must have fiddled
V-ing perfect
I must have been fiddling you must have been fiddling he must have been fiddling we must have been fiddling you must have been fiddling they must have been fiddling
Negation
Simple form
I must not fiddle you must not fiddle he must not fiddle we must not fiddle you must not fiddle they must not fiddle
V-ing form
I must not be fiddling you must not be fiddling he must not be fiddling we must not be fiddling you must not be fiddling they must not be fiddling
Perfect
I must not have fiddled you must not have fiddled he must not have fiddled we must not have fiddled you must not have fiddled they must not have fiddled
V-ing perfect
I must not have been fiddling you must not have been fiddling he must not have been fiddling we must not have been fiddling you must not have been fiddling they must not have been fiddling
Interrogative form
Simple form
must I fiddle? must you fiddle? must he fiddle? must we fiddle? must you fiddle? must they fiddle?
V-ing form
must I be fiddling? must you be fiddling? must he be fiddling? must we be fiddling? must you be fiddling? must they be fiddling?
Perfect
must I have fiddled? must you have fiddled? must he have fiddled? must we have fiddled? must you have fiddled? must they have fiddled?
V-ing perfect
must I have been fiddling? must you have been fiddling? must he have been fiddling? must we have been fiddling? must you have been fiddling? must they have been fiddling?
Interro-negative form
Simple form
must I not fiddle? must you not fiddle? must he not fiddle? must we not fiddle? must you not fiddle? must they not fiddle?
V-ing form
must I not be fiddling? must you not be fiddling? must he not be fiddling? must we not be fiddling? must you not be fiddling? must they not be fiddling?
Perfect
must I not have fiddled? must you not have fiddled? must he not have fiddled? must we not have fiddled? must you not have fiddled? must they not have fiddled?
V-ing perfect
must I not have been fiddling? must you not have been fiddling? must he not have been fiddling? must we not have been fiddling? must you not have been fiddling? must they not have been fiddling?