Americans pronounce "Sir, please learn this" as "SUR PLEEZ LURN dhihs" in casual speech. One thing happen here that bend the citation pronunciation toward how it actually sounds. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Saying a clean TH.
The TH in "this" can be produced with the tongue tip pressing just behind the upper teeth rather than coming all the way through — an easier, faster articulation. Tongue tip presses behind teeth instead of coming through (easier articulation).