English verb conjugation
CAN SQUARE

Regular verb: square - squared - squared

Affirmation

Simple form	V-ing form
I can square you can square he can square we can square you can square they can square	I can be squaring you can be squaring he can be squaring we can be squaring you can be squaring they can be squaring
Perfect	V-ing perfect
I can have squared you can have squared he can have squared we can have squared you can have squared they can have squared	I can have been squaring you can have been squaring he can have been squaring we can have been squaring you can have been squaring they can have been squaring

Negation

Simple form	V-ing form
I can't square you can't square he can't square we can't square you can't square they can't square	I can't be squaring you can't be squaring he can't be squaring we can't be squaring you can't be squaring they can't be squaring
Perfect	V-ing perfect
I can't have squared you can't have squared he can't have squared we can't have squared you can't have squared they can't have squared	I can't have been squaring you can't have been squaring he can't have been squaring we can't have been squaring you can't have been squaring they can't have been squaring

Interrogative form

Simple form	V-ing form
can I square? can you square? can he square? can we square? can you square? can they square?	can I be squaring? can you be squaring? can he be squaring? can we be squaring? can you be squaring? can they be squaring?
Perfect	V-ing perfect
can I have squared? can you have squared? can he have squared? can we have squared? can you have squared? can they have squared?	can I have been squaring? can you have been squaring? can he have been squaring? can we have been squaring? can you have been squaring? can they have been squaring?

Interro-negative form

Simple form	V-ing form
can't I square? can't you square? can't he square? can't we square? can't you square? can't they square?	can't I be squaring? can't you be squaring? can't he be squaring? can't we be squaring? can't you be squaring? can't they be squaring?
Perfect	V-ing perfect
can't I have squared? can't you have squared? can't he have squared? can't we have squared? can't you have squared? can't they have squared?	can't I have been squaring? can't you have been squaring? can't he have been squaring? can't we have been squaring? can't you have been squaring? can't they have been squaring?