I must spring-clean you must spring-clean she must spring-clean we must spring-clean you must spring-clean they must spring-clean
V-ing form
I must be spring-cleaning you must be spring-cleaning she must be spring-cleaning we must be spring-cleaning you must be spring-cleaning they must be spring-cleaning
Perfect
I must have spring-cleaned you must have spring-cleaned she must have spring-cleaned we must have spring-cleaned you must have spring-cleaned they must have spring-cleaned
V-ing perfect
I must have been spring-cleaning you must have been spring-cleaning she must have been spring-cleaning we must have been spring-cleaning you must have been spring-cleaning they must have been spring-cleaning
Negation
Simple form
I must not spring-clean you must not spring-clean she must not spring-clean we must not spring-clean you must not spring-clean they must not spring-clean
V-ing form
I must not be spring-cleaning you must not be spring-cleaning she must not be spring-cleaning we must not be spring-cleaning you must not be spring-cleaning they must not be spring-cleaning
Perfect
I must not have spring-cleaned you must not have spring-cleaned she must not have spring-cleaned we must not have spring-cleaned you must not have spring-cleaned they must not have spring-cleaned
V-ing perfect
I must not have been spring-cleaning you must not have been spring-cleaning she must not have been spring-cleaning we must not have been spring-cleaning you must not have been spring-cleaning they must not have been spring-cleaning
Interrogative form
Simple form
must I spring-clean? must you spring-clean? must she spring-clean? must we spring-clean? must you spring-clean? must they spring-clean?
V-ing form
must I be spring-cleaning? must you be spring-cleaning? must she be spring-cleaning? must we be spring-cleaning? must you be spring-cleaning? must they be spring-cleaning?
Perfect
must I have spring-cleaned? must you have spring-cleaned? must she have spring-cleaned? must we have spring-cleaned? must you have spring-cleaned? must they have spring-cleaned?
V-ing perfect
must I have been spring-cleaning? must you have been spring-cleaning? must she have been spring-cleaning? must we have been spring-cleaning? must you have been spring-cleaning? must they have been spring-cleaning?
Interro-negative form
Simple form
must I not spring-clean? must you not spring-clean? must she not spring-clean? must we not spring-clean? must you not spring-clean? must they not spring-clean?
V-ing form
must I not be spring-cleaning? must you not be spring-cleaning? must she not be spring-cleaning? must we not be spring-cleaning? must you not be spring-cleaning? must they not be spring-cleaning?
Perfect
must I not have spring-cleaned? must you not have spring-cleaned? must she not have spring-cleaned? must we not have spring-cleaned? must you not have spring-cleaned? must they not have spring-cleaned?
V-ing perfect
must I not have been spring-cleaning? must you not have been spring-cleaning? must she not have been spring-cleaning? must we not have been spring-cleaning? must you not have been spring-cleaning? must they not have been spring-cleaning?