Yup, Marlon. That´s right.
You would use "tell" there. I bet such structures, should it come up in some college entrance test (in Brazil) wouldn´t be scored by many people! It´s weird to a basic learner like me, but one has to get the hang of it. It takes a while, tough! http://www.englishclub.com/grammar/verb ... nctive.htm
The subjunctive is typically used after two structures:
the verbs: ask, command, demand, insist, propose, recommend, request, suggest + that
the expressions: it is desirable, essential, important, necessary, vital + that
Here are some examples with the subjunctive:
The manager insists that the car park be
locked at night.
The board of directors recommended that he join
It is essential that we vote
as soon as possible.
It was necessary that every student submit
his essay by the weekend.
Notice that in these structures the subjunctive is always the same. It does not matter whether the sentence is past or present. Look at these examples:
Present: The President requests that they stop
Past: The President requested that they stop
Present: It is essential that she be
Past: It was essential that she be