I must photosynthesise you must photosynthesise she must photosynthesise we must photosynthesise you must photosynthesise they must photosynthesise
V-ing form
I must be photosynthesising you must be photosynthesising she must be photosynthesising we must be photosynthesising you must be photosynthesising they must be photosynthesising
Perfect
I must have photosynthesised you must have photosynthesised she must have photosynthesised we must have photosynthesised you must have photosynthesised they must have photosynthesised
V-ing perfect
I must have been photosynthesising you must have been photosynthesising she must have been photosynthesising we must have been photosynthesising you must have been photosynthesising they must have been photosynthesising
Negation
Simple form
I must not photosynthesise you must not photosynthesise she must not photosynthesise we must not photosynthesise you must not photosynthesise they must not photosynthesise
V-ing form
I must not be photosynthesising you must not be photosynthesising she must not be photosynthesising we must not be photosynthesising you must not be photosynthesising they must not be photosynthesising
Perfect
I must not have photosynthesised you must not have photosynthesised she must not have photosynthesised we must not have photosynthesised you must not have photosynthesised they must not have photosynthesised
V-ing perfect
I must not have been photosynthesising you must not have been photosynthesising she must not have been photosynthesising we must not have been photosynthesising you must not have been photosynthesising they must not have been photosynthesising
Interrogative form
Simple form
must I photosynthesise? must you photosynthesise? must she photosynthesise? must we photosynthesise? must you photosynthesise? must they photosynthesise?
V-ing form
must I be photosynthesising? must you be photosynthesising? must she be photosynthesising? must we be photosynthesising? must you be photosynthesising? must they be photosynthesising?
Perfect
must I have photosynthesised? must you have photosynthesised? must she have photosynthesised? must we have photosynthesised? must you have photosynthesised? must they have photosynthesised?
V-ing perfect
must I have been photosynthesising? must you have been photosynthesising? must she have been photosynthesising? must we have been photosynthesising? must you have been photosynthesising? must they have been photosynthesising?
Interro-negative form
Simple form
must I not photosynthesise? must you not photosynthesise? must she not photosynthesise? must we not photosynthesise? must you not photosynthesise? must they not photosynthesise?
V-ing form
must I not be photosynthesising? must you not be photosynthesising? must she not be photosynthesising? must we not be photosynthesising? must you not be photosynthesising? must they not be photosynthesising?
Perfect
must I not have photosynthesised? must you not have photosynthesised? must she not have photosynthesised? must we not have photosynthesised? must you not have photosynthesised? must they not have photosynthesised?
V-ing perfect
must I not have been photosynthesising? must you not have been photosynthesising? must she not have been photosynthesising? must we not have been photosynthesising? must you not have been photosynthesising? must they not have been photosynthesising?