IV. The Subjunctive Mood is generally used after the following
locations, when the action refers to future time, but the Indicative is
used when the action refers to the past or present--

Despues que (after)
Aunque (although)
De modo que (so that)
No obstante que (notwithstanding)
Cuandoquiera que (whenever)
Hasta que (until)
Luego que (as soon as)
Quienquiera que (whoever)
Comoquiera que (however)
Cualquiera que (whichever, whoever)
Dondequiera que (wherever)
El 1 deg., 2 deg., 3 deg., etc., que (the 1st 2nd 3rd, etc., that)
El unico que (the only one that)
El solo que (the only one that)
El ultimo que (the last that)
Nada que (nothng that)
Ninguo, nadie que (no one that)
El mejor (or any other superlative) que (the best etc., that)

E.g.--

Escribio de modo que su padre quedo contento: He wrote so that his
father remained content.

Escriba V. de modo que su padre quede contento: Write so that your
father may remain content.

Le pague aunque no hizo su trabajo: I paid him, although he did not do
his work.

No le pagare aunque haga su trabajo: I shall not pay him although he may
do his work.

The above rules have liberties and exceptions to be learnt by practice,
generally turning on whether the action is intended to be alluded to =as
a fact= or as =a mere conception=.

V. The Subjunctive Mood is used after _cuando, asi como, luego que_ and
similar expressions when the action of the verb refers =to the future=,
as--

Lo hare cuando tenga tiempo: I shall do it when I have time.

N.B.--The Future Subjunctive is often used in this case.

VI. The Subjunctive Mood is used after _si_ (conditional _if_) when the
context requires the following verb in the past form, as--

Lo haria si tuviese (tuviera) dinero: I should do it if I had money.

N.B.--If the context requires the verb in the present form, the
Indicative Present must be used, as--

Lo hago si tengo tiempo: I do it if I have time.

Lo hare si tengo tiempo: I shall do it if I have time.

When, as in the latter example a future time is indicated, the Future
Subjunctive may be used instead of the Pres. Indicative, as--

Lo hare si tuviere tiempo: I shall do it if (ever) I have time.

VII. After _como_ the Subjunctive Mood is used idiomatically but not
necessarily, as--

Como le vio le hablo: As soon as he saw him he spoke to him.

Como le viese le hablo: On seeing him he spoke to him.

VIII. After _creer, pensar, opinar,