One word should not be used in Spanish governed by two different prepositions, as:

• He is an admirer of and a contributor to the "Times":
  Es admirador del "Times" y colabora en ese periódico.
• The man I spoke with and wrote to:
  El hombre con quien hablé y al cual escribí.

However, we find the same construction as in English in cases of antithesis, as:

• Con o sin él.
  With or without him.
• El billete cuesta 20 pesetas desde o hasta Madrid.
  The ticket is 20 ptas. from or to Madrid.

The Spanish Academy condemns this use, however.

As will have been noticed before, a preposition governing a word cannot be used after the word it governs, as:

• The work[1] which I referred to.
  La obra a la cual referí.

The preposition con followed by an infinitive translates the English "by," followed by the present participle:

• Con enseñar se aprende.
  By teaching one learns.

The preposition desde refers to "distance of time or space," as:

• He marchado desde mi casa.
  I walked from my house.

However, desde may be used instead of de before names of countries or cities:

• Me escribieron desde Barcelona.
  They wrote me from Barcelona.

Para may be used together with con = "towards":

• Fue muy bueno conmigo, para mí, or para conmigo.

"En acabando[2] lo haré" has the meaning of "I shall do it as soon as I have finished."

Sin--"without":

• Poseía £10,000 sin los bienes raíces que heredó de su padre.
  He owned £10,000 besides the real property he inherited from his father.

Según--"according to":

• Según y como.
  That depends.

And in a few other such phrases.