I must four-flush you must four-flush she must four-flush we must four-flush you must four-flush they must four-flush
V-ing form
I must be four-flushing you must be four-flushing she must be four-flushing we must be four-flushing you must be four-flushing they must be four-flushing
Perfect
I must have four-flushed you must have four-flushed she must have four-flushed we must have four-flushed you must have four-flushed they must have four-flushed
V-ing perfect
I must have been four-flushing you must have been four-flushing she must have been four-flushing we must have been four-flushing you must have been four-flushing they must have been four-flushing
Negation
Simple form
I must not four-flush you must not four-flush she must not four-flush we must not four-flush you must not four-flush they must not four-flush
V-ing form
I must not be four-flushing you must not be four-flushing she must not be four-flushing we must not be four-flushing you must not be four-flushing they must not be four-flushing
Perfect
I must not have four-flushed you must not have four-flushed she must not have four-flushed we must not have four-flushed you must not have four-flushed they must not have four-flushed
V-ing perfect
I must not have been four-flushing you must not have been four-flushing she must not have been four-flushing we must not have been four-flushing you must not have been four-flushing they must not have been four-flushing
Interrogative form
Simple form
must I four-flush? must you four-flush? must she four-flush? must we four-flush? must you four-flush? must they four-flush?
V-ing form
must I be four-flushing? must you be four-flushing? must she be four-flushing? must we be four-flushing? must you be four-flushing? must they be four-flushing?
Perfect
must I have four-flushed? must you have four-flushed? must she have four-flushed? must we have four-flushed? must you have four-flushed? must they have four-flushed?
V-ing perfect
must I have been four-flushing? must you have been four-flushing? must she have been four-flushing? must we have been four-flushing? must you have been four-flushing? must they have been four-flushing?
Interro-negative form
Simple form
must I not four-flush? must you not four-flush? must she not four-flush? must we not four-flush? must you not four-flush? must they not four-flush?
V-ing form
must I not be four-flushing? must you not be four-flushing? must she not be four-flushing? must we not be four-flushing? must you not be four-flushing? must they not be four-flushing?
Perfect
must I not have four-flushed? must you not have four-flushed? must she not have four-flushed? must we not have four-flushed? must you not have four-flushed? must they not have four-flushed?
V-ing perfect
must I not have been four-flushing? must you not have been four-flushing? must she not have been four-flushing? must we not have been four-flushing? must you not have been four-flushing? must they not have been four-flushing?