I must disgruntle you must disgruntle he must disgruntle we must disgruntle you must disgruntle they must disgruntle
V-ing form
I must be disgruntling you must be disgruntling he must be disgruntling we must be disgruntling you must be disgruntling they must be disgruntling
Perfect
I must have disgruntled you must have disgruntled he must have disgruntled we must have disgruntled you must have disgruntled they must have disgruntled
V-ing perfect
I must have been disgruntling you must have been disgruntling he must have been disgruntling we must have been disgruntling you must have been disgruntling they must have been disgruntling
Negation
Simple form
I must not disgruntle you must not disgruntle he must not disgruntle we must not disgruntle you must not disgruntle they must not disgruntle
V-ing form
I must not be disgruntling you must not be disgruntling he must not be disgruntling we must not be disgruntling you must not be disgruntling they must not be disgruntling
Perfect
I must not have disgruntled you must not have disgruntled he must not have disgruntled we must not have disgruntled you must not have disgruntled they must not have disgruntled
V-ing perfect
I must not have been disgruntling you must not have been disgruntling he must not have been disgruntling we must not have been disgruntling you must not have been disgruntling they must not have been disgruntling
Interrogative form
Simple form
must I disgruntle? must you disgruntle? must he disgruntle? must we disgruntle? must you disgruntle? must they disgruntle?
V-ing form
must I be disgruntling? must you be disgruntling? must he be disgruntling? must we be disgruntling? must you be disgruntling? must they be disgruntling?
Perfect
must I have disgruntled? must you have disgruntled? must he have disgruntled? must we have disgruntled? must you have disgruntled? must they have disgruntled?
V-ing perfect
must I have been disgruntling? must you have been disgruntling? must he have been disgruntling? must we have been disgruntling? must you have been disgruntling? must they have been disgruntling?
Interro-negative form
Simple form
must I not disgruntle? must you not disgruntle? must he not disgruntle? must we not disgruntle? must you not disgruntle? must they not disgruntle?
V-ing form
must I not be disgruntling? must you not be disgruntling? must he not be disgruntling? must we not be disgruntling? must you not be disgruntling? must they not be disgruntling?
Perfect
must I not have disgruntled? must you not have disgruntled? must he not have disgruntled? must we not have disgruntled? must you not have disgruntled? must they not have disgruntled?
V-ing perfect
must I not have been disgruntling? must you not have been disgruntling? must he not have been disgruntling? must we not have been disgruntling? must you not have been disgruntling? must they not have been disgruntling?