I must stabilise you must stabilise she must stabilise we must stabilise you must stabilise they must stabilise
V-ing form
I must be stabilising you must be stabilising she must be stabilising we must be stabilising you must be stabilising they must be stabilising
Perfect
I must have stabilised you must have stabilised she must have stabilised we must have stabilised you must have stabilised they must have stabilised
V-ing perfect
I must have been stabilising you must have been stabilising she must have been stabilising we must have been stabilising you must have been stabilising they must have been stabilising
Negation
Simple form
I must not stabilise you must not stabilise she must not stabilise we must not stabilise you must not stabilise they must not stabilise
V-ing form
I must not be stabilising you must not be stabilising she must not be stabilising we must not be stabilising you must not be stabilising they must not be stabilising
Perfect
I must not have stabilised you must not have stabilised she must not have stabilised we must not have stabilised you must not have stabilised they must not have stabilised
V-ing perfect
I must not have been stabilising you must not have been stabilising she must not have been stabilising we must not have been stabilising you must not have been stabilising they must not have been stabilising
Interrogative form
Simple form
must I stabilise? must you stabilise? must she stabilise? must we stabilise? must you stabilise? must they stabilise?
V-ing form
must I be stabilising? must you be stabilising? must she be stabilising? must we be stabilising? must you be stabilising? must they be stabilising?
Perfect
must I have stabilised? must you have stabilised? must she have stabilised? must we have stabilised? must you have stabilised? must they have stabilised?
V-ing perfect
must I have been stabilising? must you have been stabilising? must she have been stabilising? must we have been stabilising? must you have been stabilising? must they have been stabilising?
Interro-negative form
Simple form
must I not stabilise? must you not stabilise? must she not stabilise? must we not stabilise? must you not stabilise? must they not stabilise?
V-ing form
must I not be stabilising? must you not be stabilising? must she not be stabilising? must we not be stabilising? must you not be stabilising? must they not be stabilising?
Perfect
must I not have stabilised? must you not have stabilised? must she not have stabilised? must we not have stabilised? must you not have stabilised? must they not have stabilised?
V-ing perfect
must I not have been stabilising? must you not have been stabilising? must she not have been stabilising? must we not have been stabilising? must you not have been stabilising? must they not have been stabilising?