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 must not machine you must not machine she must not machine we must not machine you must not machine they must not machine
V-ing form
I must not be machining you must not be machining she must not be machining we must not be machining you must not be machining they must not be machining
Perfect
I must not have machined you must not have machined she must not have machined we must not have machined you must not have machined they must not have machined
V-ing perfect
I must not have been machining you must not have been machining she must not have been machining we must not have been machining you must not have been machining they must not 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
must I not machine? must you not machine? must she not machine? must we not machine? must you not machine? must they not machine?
V-ing form
must I not be machining? must you not be machining? must she not be machining? must we not be machining? must you not be machining? must they not be machining?
Perfect
must I not have machined? must you not have machined? must she not have machined? must we not have machined? must you not have machined? must they not have machined?
V-ing perfect
must I not have been machining? must you not have been machining? must she not have been machining? must we not have been machining? must you not have been machining? must they not have been machining?