Ce qui/Ce que and Ce qu'

Question

Think I've grasped qui v que (the youtube video v helpful) but am struggling with when to drop the e or i before a vowel. Any advice please?

Just done a test when one answer was ce qu'est and this one below:

Julien doit partir, ________ est triste.Julien must leave, which is sad.quelce qui

Accepted Answer

Theresa - struggling with the rules of elision is not at all unusual ! There is noting specific to 'ce que' or 'ce qui regarding elision in these situations - the 'rule' arises from  '....que' or '... qui'. 
Answer:  "qui" never elides - it is always written as "qui est" for example. On the other hand, "que" will elide with a word commencing with a vowel or h muet , although there is much debate online about the use of elision before a proper noun (Anne, Hugo etc). 
The links below will help make sense of most of this, I think :
https://progress.lawlessfrench.com/revision/grammar/when-to-use-qui-to-say-who-which-or-that-relative-pronouns?
https://www.lawlessfrench.com/pronunciation/elision/        
https://www.antidote.info/fr/blogue/enquetes/sous-la-direction-de-anne-dupont-ou-danne-dupont

Answer

Many thanks Maarten, very clear!

Answer

With my complicated brain I use word association. So with qui and que...you cannot drop the "i" with qui so it remains "intact". However you can drop the "e" with que so it is "executed". May sound complicated but that's how I work!