could soil
Regular verb: soil - soiled- soiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could soil
you could soil
she could soil
we could soil
you could soil
they could soil 	I could be soiling
you could be soiling
she could be soiling
we could be soiling
you could be soiling
they could be soiling	I could have soiled
you could have soiled
she could have soiled
we could have soiled
you could have soiled
they could have soiled	I could have been soiling
you could have been soiling
she could have been soiling
we could have been soiling
you could have been soiling
they could have been soiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not soil
you could not soil
she could not soil
we could not soil
you could not soil
they could not soil 	I could not be soiling
you could not be soiling
she could not be soiling
we could not be soiling
you could not be soiling
they could not be soiling	I could not have soiled
you could not have soiled
she could not have soiled
we could not have soiled
you could not have soiled
they could not have soiled	I could not have been soiling
you could not have been soiling
she could not have been soiling
we could not have been soiling
you could not have been soiling
they could not have been soiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I soil?
could you soil?
could she soil?
could we soil?
could you soil?
could they soil? 	could I be soiling?
could you be soiling?
could she be soiling?
could we be soiling?
could you be soiling?
could they be soiling? 	could I have soiled?
could you have soiled?
could she have soiled?
could we have soiled?
could you have soiled?
could they have soiled? 	could I have been soiling?
could you have been soiling?
could she have been soiling?
could we have been soiling?
could you have been soiling?
could they have been soiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not soil?
could you not soil?
could she not soil?
could we not soil?
could you not soil?
could they not soil? 	could I not be soiling?
could you not be soiling?
could she not be soiling?
could we not be soiling?
could you not be soiling?
could they not be soiling? 	could I not have soiled?
could you not have soiled?
could she not have soiled?
could we not have soiled?
could you not have soiled?
could they not have soiled? 	could I not have been soiling?
could you not have been soiling?
could she not have been soiling?
could we not have been soiling?
could you not have been soiling?
could they not have been soiling?