I must cripple you must cripple she must cripple we must cripple you must cripple they must cripple
V-ing form
I must be crippling you must be crippling she must be crippling we must be crippling you must be crippling they must be crippling
Perfect
I must have crippled you must have crippled she must have crippled we must have crippled you must have crippled they must have crippled
V-ing perfect
I must have been crippling you must have been crippling she must have been crippling we must have been crippling you must have been crippling they must have been crippling
Negation
Simple form
I must not cripple you must not cripple she must not cripple we must not cripple you must not cripple they must not cripple
V-ing form
I must not be crippling you must not be crippling she must not be crippling we must not be crippling you must not be crippling they must not be crippling
Perfect
I must not have crippled you must not have crippled she must not have crippled we must not have crippled you must not have crippled they must not have crippled
V-ing perfect
I must not have been crippling you must not have been crippling she must not have been crippling we must not have been crippling you must not have been crippling they must not have been crippling
Interrogative form
Simple form
must I cripple? must you cripple? must she cripple? must we cripple? must you cripple? must they cripple?
V-ing form
must I be crippling? must you be crippling? must she be crippling? must we be crippling? must you be crippling? must they be crippling?
Perfect
must I have crippled? must you have crippled? must she have crippled? must we have crippled? must you have crippled? must they have crippled?
V-ing perfect
must I have been crippling? must you have been crippling? must she have been crippling? must we have been crippling? must you have been crippling? must they have been crippling?
Interro-negative form
Simple form
must I not cripple? must you not cripple? must she not cripple? must we not cripple? must you not cripple? must they not cripple?
V-ing form
must I not be crippling? must you not be crippling? must she not be crippling? must we not be crippling? must you not be crippling? must they not be crippling?
Perfect
must I not have crippled? must you not have crippled? must she not have crippled? must we not have crippled? must you not have crippled? must they not have crippled?
V-ing perfect
must I not have been crippling? must you not have been crippling? must she not have been crippling? must we not have been crippling? must you not have been crippling? must they not have been crippling?