I must machine you must machine she must machine we must machine you must machine they must machine
V-ing form
I must be machining you must be machining she must be machining we must be machining you must be machining they must be machining
Perfect
I must have machined you must have machined she must have machined we must have machined you must have machined they must have machined
V-ing perfect
I must have been machining you must have been machining she must have been machining we must have been machining you must have been machining they must have been machining
Negation
Simple form
I mustn't machine you mustn't machine she mustn't machine we mustn't machine you mustn't machine they mustn't machine
V-ing form
I mustn't be machining you mustn't be machining she mustn't be machining we mustn't be machining you mustn't be machining they mustn't be machining
Perfect
I mustn't have machined you mustn't have machined she mustn't have machined we mustn't have machined you mustn't have machined they mustn't have machined
V-ing perfect
I mustn't have been machining you mustn't have been machining she mustn't have been machining we mustn't have been machining you mustn't have been machining they mustn't have been machining
Interrogative form
Simple form
must I machine? must you machine? must she machine? must we machine? must you machine? must they machine?
V-ing form
must I be machining? must you be machining? must she be machining? must we be machining? must you be machining? must they be machining?
Perfect
must I have machined? must you have machined? must she have machined? must we have machined? must you have machined? must they have machined?
V-ing perfect
must I have been machining? must you have been machining? must she have been machining? must we have been machining? must you have been machining? must they have been machining?
Interro-negative form
Simple form
mustn't I machine? mustn't you machine? mustn't she machine? mustn't we machine? mustn't you machine? mustn't they machine?
V-ing form
mustn't I be machining? mustn't you be machining? mustn't she be machining? mustn't we be machining? mustn't you be machining? mustn't they be machining?
Perfect
mustn't I have machined? mustn't you have machined? mustn't she have machined? mustn't we have machined? mustn't you have machined? mustn't they have machined?
V-ing perfect
mustn't I have been machining? mustn't you have been machining? mustn't she have been machining? mustn't we have been machining? mustn't you have been machining? mustn't they have been machining?