I must solder you must solder he must solder we must solder you must solder they must solder
V-ing form
I must be soldering you must be soldering he must be soldering we must be soldering you must be soldering they must be soldering
Perfect
I must have soldered you must have soldered he must have soldered we must have soldered you must have soldered they must have soldered
V-ing perfect
I must have been soldering you must have been soldering he must have been soldering we must have been soldering you must have been soldering they must have been soldering
Negation
Simple form
I must not solder you must not solder he must not solder we must not solder you must not solder they must not solder
V-ing form
I must not be soldering you must not be soldering he must not be soldering we must not be soldering you must not be soldering they must not be soldering
Perfect
I must not have soldered you must not have soldered he must not have soldered we must not have soldered you must not have soldered they must not have soldered
V-ing perfect
I must not have been soldering you must not have been soldering he must not have been soldering we must not have been soldering you must not have been soldering they must not have been soldering
Interrogative form
Simple form
must I solder? must you solder? must he solder? must we solder? must you solder? must they solder?
V-ing form
must I be soldering? must you be soldering? must he be soldering? must we be soldering? must you be soldering? must they be soldering?
Perfect
must I have soldered? must you have soldered? must he have soldered? must we have soldered? must you have soldered? must they have soldered?
V-ing perfect
must I have been soldering? must you have been soldering? must he have been soldering? must we have been soldering? must you have been soldering? must they have been soldering?
Interro-negative form
Simple form
must I not solder? must you not solder? must he not solder? must we not solder? must you not solder? must they not solder?
V-ing form
must I not be soldering? must you not be soldering? must he not be soldering? must we not be soldering? must you not be soldering? must they not be soldering?
Perfect
must I not have soldered? must you not have soldered? must he not have soldered? must we not have soldered? must you not have soldered? must they not have soldered?
V-ing perfect
must I not have been soldering? must you not have been soldering? must he not have been soldering? must we not have been soldering? must you not have been soldering? must they not have been soldering?