The Subjunctive - "Trigger Clauses"

The present subjunctive can be implemented with several indicative clauses that "trigger" a subjunctive, or subordinate(dependent) clause. Even in English, the sound of these trigger clauses calls for the subjunctive clause to follow because they imply an imposition of will or desire:

insistir en	to insist	Insisto en que vengas a mi casa.	I insist you come to my house.
exigir	to demand	El maestro nos exige que hagamos nuestra tarea.	The teacher demands we do our homework.
querer	to want	Mi madre quiere que tú cenes con nosotros.	My mother wants you to eat dinner with us.
necesitar	to need	Necesito que me trabajes.	I need you to work for me.
mandar	to order, to demand	El doctor me manda que yo baje peso.	The doctor orders me to lose weight.
prohibir	to prohibit	La ley nos prohíbe que fumemos en los ascensores.	The law prohibits us from smoking in the elevators.
pedir	to ask for	David pide que yo le compre el libro.	David asks me to buy him the book.
recomendar	to recommend	¿Tú me recomiendas que me vista?	Do you recommend that I get dressed?

It is important to understand that this list is not all-inclusive. Basically, any clause you would use in English to imply a desire, want, or need would be used in Spanish with the subjunctive clauses adjoining the indicative ones.