Comparative Chart of those little words in Spanish that confuse us terribly and must be used constantly.
Write a personal sentence with each one of the following words:
Personal Pronouns Reflexive Pronouns Direct Obj. Pronouns,
who/what		 Indirect Obj. Pronouns, whom Passive Im - personal Prepositional Pronouns Preposition "con" Possessive Adjectives, with noun Possessive Pronouns, no noun
(I) yo (myself) me (me) me (me) me   X (me) mí (with me)
conmigo		 (my) mi - s (mine)
mío - s
mía - s
(you) tú (yourself) te (you) te (you) te  X (you) ti (with you)
contigo		 (your)
tu - s		 (yours)
tuyo -a - s
(you) usted (yourself) se (you formal) le (you formal) le   X (you) usted,sí (w/yourself) consigo (your) su -s (yours) suyo - a - s
(he) él (himself) se (him) lo
le**		 (him) le (he) se (him) él (himself) sí (w/himself) consigo (his) su - s (his) suyo - a - s
(she) ella (herself) se (her) la (her) le (her) se (her) ella (w/herself) consigo (her) su - s (hers) suyo - a - s
(it)él, ella (itself) se lo - la le se (itself) él - ella - sí (w/himself, w/herself) consigo (its) su - s (its) suyo-a-s
(we) nosotros-as (to ourselves) nos (us) nos (to us) nos X (us) nosotros (with us) nosotros (our) nuestro-a-s (ours) nuestro-a-s
(you all in Spain*) vosotros (yourselves) os (you fam.) os (to you)
os		 X (you) vosotros-as (with you) vosotros-as (your) vuestro-a-s (yours) vuestro-a-s
(you all formal) ustedes (yourselves) se (you formal)
los, las, les**		 (you formal) les X (you) ustedes (with you) ustedes (your)
su - s		 (yours) suyo-a-s
(they) ellos-ellas (themselves) se (them) los-las (to them) les X (them, themselves) ellos-ellas-sí (with themselves) consigo (their) su-s (theirs) suyo-a-s
1*Used mostly in Spain as an informal for you all. 2**Used mostly in Spain when referred to people.

There are 19 simple prepositions in Spanish used with prepositional pronouns :
a, ante, bajo, cabe, con, contra, de, desde, en, entre, hacia, hasta, para, por, según, sin, so, sobre, tras.