I must compost you must compost he must compost we must compost you must compost they must compost
V-ing form
I must be composting you must be composting he must be composting we must be composting you must be composting they must be composting
Perfect
I must have composted you must have composted he must have composted we must have composted you must have composted they must have composted
V-ing perfect
I must have been composting you must have been composting he must have been composting we must have been composting you must have been composting they must have been composting
Negation
Simple form
I must not compost you must not compost he must not compost we must not compost you must not compost they must not compost
V-ing form
I must not be composting you must not be composting he must not be composting we must not be composting you must not be composting they must not be composting
Perfect
I must not have composted you must not have composted he must not have composted we must not have composted you must not have composted they must not have composted
V-ing perfect
I must not have been composting you must not have been composting he must not have been composting we must not have been composting you must not have been composting they must not have been composting
Interrogative form
Simple form
must I compost? must you compost? must he compost? must we compost? must you compost? must they compost?
V-ing form
must I be composting? must you be composting? must he be composting? must we be composting? must you be composting? must they be composting?
Perfect
must I have composted? must you have composted? must he have composted? must we have composted? must you have composted? must they have composted?
V-ing perfect
must I have been composting? must you have been composting? must he have been composting? must we have been composting? must you have been composting? must they have been composting?
Interro-negative form
Simple form
must I not compost? must you not compost? must he not compost? must we not compost? must you not compost? must they not compost?
V-ing form
must I not be composting? must you not be composting? must he not be composting? must we not be composting? must you not be composting? must they not be composting?
Perfect
must I not have composted? must you not have composted? must he not have composted? must we not have composted? must you not have composted? must they not have composted?
V-ing perfect
must I not have been composting? must you not have been composting? must he not have been composting? must we not have been composting? must you not have been composting? must they not have been composting?