In your example of the tu form of appeler, is that correct?

Question

j'appelle 
tu appelles   Shouldn't this be (t'appelles)? If not, why?
il/elle/on appelle
nous appelons
vous appelez
ils/elles appellent

Cécile Janty-Davies · Accepted Answer

Hi Lisa,
Are you confusing "Tu t'appelles" which is the verb 's'appeler' (to be called/named) with the verb 'appeler' in the lesson which simply means 'to call'.
e.g.
"Tu appelles ta mère ce soir sans faute, d'accord?" (You are calling your mother tonight without fail, okay?)
"Tu t'appelles Marie, n'est-ce -pas?" (Your name is Marie, isnt' it ? ")
Hope this helps!

Chris Wirt · Answer

Hi Lisa,
no, "tu appelles" is correct. There is no elision between the letters u and a. Almost all elisions happen between a preceding e and the following vowel. For a more encompassing list of possibilities look here:
https://www.lawlessfrench.com/pronunciation/elision/
-- Chris (not a native speaker).