ci, ji, su and gang are indefinite particles.
ci is used before zhig, ste, slad, ‘dra and phyir.
ji is used before snyed, srid, ltar, bzhin and skad.
su applies to people only, but gang is universal.
Chapter 7: Obtaining initiations and oral instructions

Lama Marpa, from Himalayan Art.
In Chapter 7, Milarepa continues to try to satisfy the demands of his teacher, Marpa, until in despair he leaves to study with another teacher. In this Unit, you will read the seventh chapter of this abridged life story while continuing to learn new grammatical constructions and expressions. You will memorize a traditional grammar verse about indefinite particles and practice word sequencing for some short Tibetan sentences. You will also learn how to use a Tibetan dictionary.
When you’re ready to study Chapter Seven, begin with 7.1 Grammar Preview and 7.2 Sentence Building. With those, you should be ready to try 7.3 Reading & Translation. You should also memorize the Tibetan grammar verse, review your grammar with 7.5 Sequencing Practice, and practice your pronunciation by following along with 7.6 Reading Aloud. Finally, in 7.7 you will learn how to look up words in a Tibetan dictionary.
Reading & Translation from the Life of Milarepa
On indefinite particles
Rearrange the following words so that they make the phrase below in correct Tibetan word order. For help, press the Colors button to color words according to their grammatical categories, or the Hint button to show word glosses when hovering over a word.
When you are finished with an example, press Mark. If your answer is correct, then press Next to move on to the next example. If your answer is incorrect, then you may have to repeat the exercise one or more times. Press the Repeat button to do so. Note that this is just to give you more practice; repeat attempts will neither help nor hurt your score. When you have attempted an exercise as many times as allowed, then press Answer to see the answer.