As a son of expats, who had to pick up English early on I noticed that I do indeed shape my lips in the form of those silent letters, but never pronounce them.

As a son of expats, who had to pick up English early on I noticed that I do indeed shape my lips in the form of those silent letters, but never pronounce them. As example when saying "debt" I will close my mouth entirely at some point, even though it shouldn't be necessary.