I must interact you must interact she must interact we must interact you must interact they must interact
V-ing form
I must be interacting you must be interacting she must be interacting we must be interacting you must be interacting they must be interacting
Perfect
I must have interacted you must have interacted she must have interacted we must have interacted you must have interacted they must have interacted
V-ing perfect
I must have been interacting you must have been interacting she must have been interacting we must have been interacting you must have been interacting they must have been interacting
Negation
Simple form
I must not interact you must not interact she must not interact we must not interact you must not interact they must not interact
V-ing form
I must not be interacting you must not be interacting she must not be interacting we must not be interacting you must not be interacting they must not be interacting
Perfect
I must not have interacted you must not have interacted she must not have interacted we must not have interacted you must not have interacted they must not have interacted
V-ing perfect
I must not have been interacting you must not have been interacting she must not have been interacting we must not have been interacting you must not have been interacting they must not have been interacting
Interrogative form
Simple form
must I interact? must you interact? must she interact? must we interact? must you interact? must they interact?
V-ing form
must I be interacting? must you be interacting? must she be interacting? must we be interacting? must you be interacting? must they be interacting?
Perfect
must I have interacted? must you have interacted? must she have interacted? must we have interacted? must you have interacted? must they have interacted?
V-ing perfect
must I have been interacting? must you have been interacting? must she have been interacting? must we have been interacting? must you have been interacting? must they have been interacting?
Interro-negative form
Simple form
must I not interact? must you not interact? must she not interact? must we not interact? must you not interact? must they not interact?
V-ing form
must I not be interacting? must you not be interacting? must she not be interacting? must we not be interacting? must you not be interacting? must they not be interacting?
Perfect
must I not have interacted? must you not have interacted? must she not have interacted? must we not have interacted? must you not have interacted? must they not have interacted?
V-ing perfect
must I not have been interacting? must you not have been interacting? must she not have been interacting? must we not have been interacting? must you not have been interacting? must they not have been interacting?