Although we don't use present subjunctive often, there are some kind of times you practically need to use it. For example, in British-English you usually use "should" in the present subjunctive clause. Let's take a look:
"The teacher demanded that the student not miss the classes anymore."
British people would usually say "The teacher demanded that the student should not miss the classes anymore." instead; otherwise, they know it would sound too formal.
But I just found how to make present subjunctive LESS FORMALLY in British-English by using "should". But I didn't find anywhere in internet a teacher explaining how we can use the present subjunctive in a less formal way the same thing we do in British-English (since people say "should" is not used in present subjunctive on American-English).
Thanks in advance for those who can help me!