I must extemporise you must extemporise she must extemporise we must extemporise you must extemporise they must extemporise
V-ing form
I must be extemporising you must be extemporising she must be extemporising we must be extemporising you must be extemporising they must be extemporising
Perfect
I must have extemporised you must have extemporised she must have extemporised we must have extemporised you must have extemporised they must have extemporised
V-ing perfect
I must have been extemporising you must have been extemporising she must have been extemporising we must have been extemporising you must have been extemporising they must have been extemporising
Negation
Simple form
I must not extemporise you must not extemporise she must not extemporise we must not extemporise you must not extemporise they must not extemporise
V-ing form
I must not be extemporising you must not be extemporising she must not be extemporising we must not be extemporising you must not be extemporising they must not be extemporising
Perfect
I must not have extemporised you must not have extemporised she must not have extemporised we must not have extemporised you must not have extemporised they must not have extemporised
V-ing perfect
I must not have been extemporising you must not have been extemporising she must not have been extemporising we must not have been extemporising you must not have been extemporising they must not have been extemporising
Interrogative form
Simple form
must I extemporise? must you extemporise? must she extemporise? must we extemporise? must you extemporise? must they extemporise?
V-ing form
must I be extemporising? must you be extemporising? must she be extemporising? must we be extemporising? must you be extemporising? must they be extemporising?
Perfect
must I have extemporised? must you have extemporised? must she have extemporised? must we have extemporised? must you have extemporised? must they have extemporised?
V-ing perfect
must I have been extemporising? must you have been extemporising? must she have been extemporising? must we have been extemporising? must you have been extemporising? must they have been extemporising?
Interro-negative form
Simple form
must I not extemporise? must you not extemporise? must she not extemporise? must we not extemporise? must you not extemporise? must they not extemporise?
V-ing form
must I not be extemporising? must you not be extemporising? must she not be extemporising? must we not be extemporising? must you not be extemporising? must they not be extemporising?
Perfect
must I not have extemporised? must you not have extemporised? must she not have extemporised? must we not have extemporised? must you not have extemporised? must they not have extemporised?
V-ing perfect
must I not have been extemporising? must you not have been extemporising? must she not have been extemporising? must we not have been extemporising? must you not have been extemporising? must they not have been extemporising?