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 must not tend you must not tend he must not tend we must not tend you must not tend they must not tend
V-ing form
I must not be tending you must not be tending he must not be tending we must not be tending you must not be tending they must not be tending
Perfect
I must not have tended you must not have tended he must not have tended we must not have tended you must not have tended they must not have tended
V-ing perfect
I must not have been tending you must not have been tending he must not have been tending we must not have been tending you must not have been tending they must not 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
must I not tend? must you not tend? must he not tend? must we not tend? must you not tend? must they not tend?
V-ing form
must I not be tending? must you not be tending? must he not be tending? must we not be tending? must you not be tending? must they not be tending?
Perfect
must I not have tended? must you not have tended? must he not have tended? must we not have tended? must you not have tended? must they not have tended?
V-ing perfect
must I not have been tending? must you not have been tending? must he not have been tending? must we not have been tending? must you not have been tending? must they not have been tending?