I must square you must square he must square we must square you must square they must square
V-ing form
I must be squaring you must be squaring he must be squaring we must be squaring you must be squaring they must be squaring
Perfect
I must have squared you must have squared he must have squared we must have squared you must have squared they must have squared
V-ing perfect
I must have been squaring you must have been squaring he must have been squaring we must have been squaring you must have been squaring they must have been squaring
Negation
Simple form
I must not square you must not square he must not square we must not square you must not square they must not square
V-ing form
I must not be squaring you must not be squaring he must not be squaring we must not be squaring you must not be squaring they must not be squaring
Perfect
I must not have squared you must not have squared he must not have squared we must not have squared you must not have squared they must not have squared
V-ing perfect
I must not have been squaring you must not have been squaring he must not have been squaring we must not have been squaring you must not have been squaring they must not have been squaring
Interrogative form
Simple form
must I square? must you square? must he square? must we square? must you square? must they square?
V-ing form
must I be squaring? must you be squaring? must he be squaring? must we be squaring? must you be squaring? must they be squaring?
Perfect
must I have squared? must you have squared? must he have squared? must we have squared? must you have squared? must they have squared?
V-ing perfect
must I have been squaring? must you have been squaring? must he have been squaring? must we have been squaring? must you have been squaring? must they have been squaring?
Interro-negative form
Simple form
must I not square? must you not square? must he not square? must we not square? must you not square? must they not square?
V-ing form
must I not be squaring? must you not be squaring? must he not be squaring? must we not be squaring? must you not be squaring? must they not be squaring?
Perfect
must I not have squared? must you not have squared? must he not have squared? must we not have squared? must you not have squared? must they not have squared?
V-ing perfect
must I not have been squaring? must you not have been squaring? must he not have been squaring? must we not have been squaring? must you not have been squaring? must they not have been squaring?