Forty sounds like for-dy; however, forteen is still pronounced as for-teen. Shouldn't /t/ be changed into /d/ as long as it is surrounded by two vowels? I wonder why forteeen doesn't sound like for-deen.
It's because "-teen" is a stressed syllable, and "-ty" is not. I've heard actors trying to do an "American accent" make this mistake.
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It's because "-teen" is a stressed syllable, and "-ty" is not. I've heard actors trying to do an "American accent" make this mistake.
LissleForty sounds like for-dy
That's in American English or for-ty in British English.
For a very detailed description of the pronunciation of "t" in American English, perhaps even too detailed, see this thread.
How to pronounce a 't' in American English
CJ