mix

Sounds mix together to make new sounds

Sometimes when two consonant sounds come together, one at the end of one word and one at the beginning of another. They mix to form a new sound. 
The "d" and the "y" mix together and make a new sound that sounds like a "j" sound. The sentence sounds like:
Why is it that students have trouble with naturally spoken English? Often it is a simple answer. They have never been taught how English is naturally spoken! 

"Would you" sounds like "wou-jew"

"What you" sounds like "wha-chew"

Listening teachers need to tell their students this.

We need to show our students how sounds mix together.