In casual American English, "It is hard to see in the dark" sounds like "iht ihz HARD tuh SEE ihn dhuh DARK". Several things happen here, and the headline one is the Unreleased Stops: the final stop consonant closes without a puff of air. Keep stressed words long, unstressed words short, and link the consonants forward into the vowels.
Now you try.
Read the sentence out loud at native speed. The mic stays on your device — nothing's uploaded.
What makes this sentence sound American.
In "hard", the "" is not released — the articulators get into position but hold without the burst of air. This is called the Unreleased Stops, and it's one of the defining features of casual American English. It comes out as HARD.
What's happening in this sentence.
Small tricks that turn a textbook sentence into how an American actually says it.
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Releasing the final consonant with a puff of air.
In "hard", the "" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.
Hard T at the end of a word, not a flap.
The "t" at the end of "" links to the vowel starting "" — it flaps to sound like a quick "d", with the tongue briefly tapping the ridge behind the upper teeth. Same flap as within-word (R1) but spanning two words.
Leaving a gap between two vowels.
Between "" and "", a brief "" glide bridges the two vowels for smooth flow. A brief glide (y or w) bridges two vowels for smooth flow.
Pronouncing the function word too fully.
"it" is a function word — in connected speech, the full vowel reduces to a quick "" sound and consonants may simplify. Full vowel reduces to schwa /ə/ or other weak vowel. Consonants may simplify.