I must botanise you must botanise he must botanise we must botanise you must botanise they must botanise
V-ing form
I must be botanising you must be botanising he must be botanising we must be botanising you must be botanising they must be botanising
Perfect
I must have botanised you must have botanised he must have botanised we must have botanised you must have botanised they must have botanised
V-ing perfect
I must have been botanising you must have been botanising he must have been botanising we must have been botanising you must have been botanising they must have been botanising
Negation
Simple form
I mustn't botanise you mustn't botanise he mustn't botanise we mustn't botanise you mustn't botanise they mustn't botanise
V-ing form
I mustn't be botanising you mustn't be botanising he mustn't be botanising we mustn't be botanising you mustn't be botanising they mustn't be botanising
Perfect
I mustn't have botanised you mustn't have botanised he mustn't have botanised we mustn't have botanised you mustn't have botanised they mustn't have botanised
V-ing perfect
I mustn't have been botanising you mustn't have been botanising he mustn't have been botanising we mustn't have been botanising you mustn't have been botanising they mustn't have been botanising
Interrogative form
Simple form
must I botanise? must you botanise? must he botanise? must we botanise? must you botanise? must they botanise?
V-ing form
must I be botanising? must you be botanising? must he be botanising? must we be botanising? must you be botanising? must they be botanising?
Perfect
must I have botanised? must you have botanised? must he have botanised? must we have botanised? must you have botanised? must they have botanised?
V-ing perfect
must I have been botanising? must you have been botanising? must he have been botanising? must we have been botanising? must you have been botanising? must they have been botanising?
Interro-negative form
Simple form
mustn't I botanise? mustn't you botanise? mustn't he botanise? mustn't we botanise? mustn't you botanise? mustn't they botanise?
V-ing form
mustn't I be botanising? mustn't you be botanising? mustn't he be botanising? mustn't we be botanising? mustn't you be botanising? mustn't they be botanising?
Perfect
mustn't I have botanised? mustn't you have botanised? mustn't he have botanised? mustn't we have botanised? mustn't you have botanised? mustn't they have botanised?
V-ing perfect
mustn't I have been botanising? mustn't you have been botanising? mustn't he have been botanising? mustn't we have been botanising? mustn't you have been botanising? mustn't they have been botanising?