could square
Regular verb: square - squared- squared

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could square
you could square
she could square
we could square
you could square
they could square 	I could be squaring
you could be squaring
she could be squaring
we could be squaring
you could be squaring
they could be squaring	I could have squared
you could have squared
she could have squared
we could have squared
you could have squared
they could have squared	I could have been squaring
you could have been squaring
she could have been squaring
we could have been squaring
you could have been squaring
they could have been squaring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't square
you couldn't square
she couldn't square
we couldn't square
you couldn't square
they couldn't square 	I couldn't be squaring
you couldn't be squaring
she couldn't be squaring
we couldn't be squaring
you couldn't be squaring
they couldn't be squaring	I couldn't have squared
you couldn't have squared
she couldn't have squared
we couldn't have squared
you couldn't have squared
they couldn't have squared	I couldn't have been squaring
you couldn't have been squaring
she couldn't have been squaring
we couldn't have been squaring
you couldn't have been squaring
they couldn't have been squaring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I square?
could you square?
could she square?
could we square?
could you square?
could they square? 	could I be squaring?
could you be squaring?
could she be squaring?
could we be squaring?
could you be squaring?
could they be squaring? 	could I have squared?
could you have squared?
could she have squared?
could we have squared?
could you have squared?
could they have squared? 	could I have been squaring?
could you have been squaring?
could she have been squaring?
could we have been squaring?
could you have been squaring?
could they have been squaring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I square?
couldn't you square?
couldn't she square?
couldn't we square?
couldn't you square?
couldn't they square? 	couldn't I be squaring?
couldn't you be squaring?
couldn't she be squaring?
couldn't we be squaring?
couldn't you be squaring?
couldn't they be squaring? 	couldn't I have squared?
couldn't you have squared?
couldn't she have squared?
couldn't we have squared?
couldn't you have squared?
couldn't they have squared? 	couldn't I have been squaring?
couldn't you have been squaring?
couldn't she have been squaring?
couldn't we have been squaring?
couldn't you have been squaring?
couldn't they have been squaring?