The following words are mispronounced frequently: subtle, cupboard, soften.
You could try to?pronounce them, if you are very interested in contact me, you could write a comment, and then check your pronunciation through looking up a dictionary.
This is fascinating!
subtle– not pronounce /b/
cupboard– not pronounce /p/
soften– not pronouce /t/
these ‘t’s in the following words cannot be pronounced: whistle bristle gristle