I know that acting lessons often have enunciation training. That's partially why there is a "TV accent" that's more or less regarded as the standard US accent.

I know that acting lessons often have enunciation training. That's partially why there is a "TV accent" that's more or less regarded as the standard US accent. As a non-native English speaker, I've found that the best way to make myself understandable is to enunciate the consonance clearly. It sounds weird sometimes, and clearly not native, but it's always clear. Another thing I've trained myself to do is the control of rhythm and stresses. I got this idea from a book on poetry, which classified English as a stress-timed language. Coming from a mother tone of Chinese, I'm not used to grouping rhythm centered on stress syllables. For me, stresses used to live just within an English word, as notated by the dictionary. When I started to pay attention to a sentence-level flow of stresses, I finally understand how English speaking people gloss over some syllables and emphasize on others. I've even noticed that many eloquent speakers naturally slip into a iambic pentameter when they talk.