I must decompose you must decompose he must decompose we must decompose you must decompose they must decompose
V-ing form
I must be decomposing you must be decomposing he must be decomposing we must be decomposing you must be decomposing they must be decomposing
Perfect
I must have decomposed you must have decomposed he must have decomposed we must have decomposed you must have decomposed they must have decomposed
V-ing perfect
I must have been decomposing you must have been decomposing he must have been decomposing we must have been decomposing you must have been decomposing they must have been decomposing
Negation
Simple form
I must not decompose you must not decompose he must not decompose we must not decompose you must not decompose they must not decompose
V-ing form
I must not be decomposing you must not be decomposing he must not be decomposing we must not be decomposing you must not be decomposing they must not be decomposing
Perfect
I must not have decomposed you must not have decomposed he must not have decomposed we must not have decomposed you must not have decomposed they must not have decomposed
V-ing perfect
I must not have been decomposing you must not have been decomposing he must not have been decomposing we must not have been decomposing you must not have been decomposing they must not have been decomposing
Interrogative form
Simple form
must I decompose? must you decompose? must he decompose? must we decompose? must you decompose? must they decompose?
V-ing form
must I be decomposing? must you be decomposing? must he be decomposing? must we be decomposing? must you be decomposing? must they be decomposing?
Perfect
must I have decomposed? must you have decomposed? must he have decomposed? must we have decomposed? must you have decomposed? must they have decomposed?
V-ing perfect
must I have been decomposing? must you have been decomposing? must he have been decomposing? must we have been decomposing? must you have been decomposing? must they have been decomposing?
Interro-negative form
Simple form
must I not decompose? must you not decompose? must he not decompose? must we not decompose? must you not decompose? must they not decompose?
V-ing form
must I not be decomposing? must you not be decomposing? must he not be decomposing? must we not be decomposing? must you not be decomposing? must they not be decomposing?
Perfect
must I not have decomposed? must you not have decomposed? must he not have decomposed? must we not have decomposed? must you not have decomposed? must they not have decomposed?
V-ing perfect
must I not have been decomposing? must you not have been decomposing? must he not have been decomposing? must we not have been decomposing? must you not have been decomposing? must they not have been decomposing?