could spring-clean
Regular verb: spring-clean - spring-cleaned- spring-cleaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spring-clean
you could spring-clean
she could spring-clean
we could spring-clean
you could spring-clean
they could spring-clean 	I could be spring-cleaning
you could be spring-cleaning
she could be spring-cleaning
we could be spring-cleaning
you could be spring-cleaning
they could be spring-cleaning	I could have spring-cleaned
you could have spring-cleaned
she could have spring-cleaned
we could have spring-cleaned
you could have spring-cleaned
they could have spring-cleaned	I could have been spring-cleaning
you could have been spring-cleaning
she could have been spring-cleaning
we could have been spring-cleaning
you could have been spring-cleaning
they could have been spring-cleaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't spring-clean
you couldn't spring-clean
she couldn't spring-clean
we couldn't spring-clean
you couldn't spring-clean
they couldn't spring-clean 	I couldn't be spring-cleaning
you couldn't be spring-cleaning
she couldn't be spring-cleaning
we couldn't be spring-cleaning
you couldn't be spring-cleaning
they couldn't be spring-cleaning	I couldn't have spring-cleaned
you couldn't have spring-cleaned
she couldn't have spring-cleaned
we couldn't have spring-cleaned
you couldn't have spring-cleaned
they couldn't have spring-cleaned	I couldn't have been spring-cleaning
you couldn't have been spring-cleaning
she couldn't have been spring-cleaning
we couldn't have been spring-cleaning
you couldn't have been spring-cleaning
they couldn't have been spring-cleaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spring-clean?
could you spring-clean?
could she spring-clean?
could we spring-clean?
could you spring-clean?
could they spring-clean? 	could I be spring-cleaning?
could you be spring-cleaning?
could she be spring-cleaning?
could we be spring-cleaning?
could you be spring-cleaning?
could they be spring-cleaning? 	could I have spring-cleaned?
could you have spring-cleaned?
could she have spring-cleaned?
could we have spring-cleaned?
could you have spring-cleaned?
could they have spring-cleaned? 	could I have been spring-cleaning?
could you have been spring-cleaning?
could she have been spring-cleaning?
could we have been spring-cleaning?
could you have been spring-cleaning?
could they have been spring-cleaning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I spring-clean?
couldn't you spring-clean?
couldn't she spring-clean?
couldn't we spring-clean?
couldn't you spring-clean?
couldn't they spring-clean? 	couldn't I be spring-cleaning?
couldn't you be spring-cleaning?
couldn't she be spring-cleaning?
couldn't we be spring-cleaning?
couldn't you be spring-cleaning?
couldn't they be spring-cleaning? 	couldn't I have spring-cleaned?
couldn't you have spring-cleaned?
couldn't she have spring-cleaned?
couldn't we have spring-cleaned?
couldn't you have spring-cleaned?
couldn't they have spring-cleaned? 	couldn't I have been spring-cleaning?
couldn't you have been spring-cleaning?
couldn't she have been spring-cleaning?
couldn't we have been spring-cleaning?
couldn't you have been spring-cleaning?
couldn't they have been spring-cleaning?