I must oscillate you must oscillate he must oscillate we must oscillate you must oscillate they must oscillate
V-ing form
I must be oscillating you must be oscillating he must be oscillating we must be oscillating you must be oscillating they must be oscillating
Perfect
I must have oscillated you must have oscillated he must have oscillated we must have oscillated you must have oscillated they must have oscillated
V-ing perfect
I must have been oscillating you must have been oscillating he must have been oscillating we must have been oscillating you must have been oscillating they must have been oscillating
Negation
Simple form
I mustn't oscillate you mustn't oscillate he mustn't oscillate we mustn't oscillate you mustn't oscillate they mustn't oscillate
V-ing form
I mustn't be oscillating you mustn't be oscillating he mustn't be oscillating we mustn't be oscillating you mustn't be oscillating they mustn't be oscillating
Perfect
I mustn't have oscillated you mustn't have oscillated he mustn't have oscillated we mustn't have oscillated you mustn't have oscillated they mustn't have oscillated
V-ing perfect
I mustn't have been oscillating you mustn't have been oscillating he mustn't have been oscillating we mustn't have been oscillating you mustn't have been oscillating they mustn't have been oscillating
Interrogative form
Simple form
must I oscillate? must you oscillate? must he oscillate? must we oscillate? must you oscillate? must they oscillate?
V-ing form
must I be oscillating? must you be oscillating? must he be oscillating? must we be oscillating? must you be oscillating? must they be oscillating?
Perfect
must I have oscillated? must you have oscillated? must he have oscillated? must we have oscillated? must you have oscillated? must they have oscillated?
V-ing perfect
must I have been oscillating? must you have been oscillating? must he have been oscillating? must we have been oscillating? must you have been oscillating? must they have been oscillating?
Interro-negative form
Simple form
mustn't I oscillate? mustn't you oscillate? mustn't he oscillate? mustn't we oscillate? mustn't you oscillate? mustn't they oscillate?
V-ing form
mustn't I be oscillating? mustn't you be oscillating? mustn't he be oscillating? mustn't we be oscillating? mustn't you be oscillating? mustn't they be oscillating?
Perfect
mustn't I have oscillated? mustn't you have oscillated? mustn't he have oscillated? mustn't we have oscillated? mustn't you have oscillated? mustn't they have oscillated?
V-ing perfect
mustn't I have been oscillating? mustn't you have been oscillating? mustn't he have been oscillating? mustn't we have been oscillating? mustn't you have been oscillating? mustn't they have been oscillating?