I have a question about subjenctive verbs in their present form. Do they appear only in continuous and simple forms? I mean "be + ing" and "be"?

Are these subjunctive forms correct?

I decided that she not be going. ( Meaning I mean: I decided that she isn't going)
I decided that Jim not go anywhere. (Meaning I mean: I decided that Jim doesn't go anywhere)

Sorry. The samples you give are not correct. "decide" isn't a good verb to use to illustrate the subjunctive. Let's change it to "insist" and show the correct usage.

I insisted that she not go.
I insisted that Jim not go anywhere.

I insisted that the prisoner be freed.
I insisted that the children be taken care of.

"being" isn't a subjunctive form.

Emotion: geeked