Consonant clusters with the letter H. Like 
in English, in French, some consonants are  
followed by H. Let's begin with C and H. When 
combined, most of the time they are pronounced  
like the English "sh". Here are a few examples. 
Machine, vache, poche, chic, architecture. But then again  
there are exceptions to this rule. There are 
two sets of exceptions. Look at the first one: 
psychiatre, chaos, archéologie, chronologie. As you can see in this 
case the "ch" is pronounced like C.  
But there are other kinds of exceptions 
as well. Now listen to these ones. tchao match,   
coach, tchatter. In this case, the "ch" 
is pronounced like the English "ch". 
Sometimes, to produce the "sh" sound,  
some words  are spelled 
with "sh” just like in English. For example,
showbiz, shampooing, shakespearien. But then again 
when this "sh" is preceded by  
D and é then it is actually 
pronounced like a Z, like déshydrater, déshériter, déshonorer
Okay. Now, I did not go over the PH 
combination because it's pretty 
straightforward and similar to English. I 
recommend that you read page 4.2 for that  
and click on the audio players and repeat. 
Let's look at "th". The consonant cluster "th"  
in French is never pronounced like in the 
English "th". This is because H is silent in  
French. So only the T is pronounced. Let's 
look at some examples: thé, athlète mathématiques, théâtre.
Okay. Uh that's it. Quite straightforward.