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