Liz Plampton explained how to change the pronunciation of certain English words with one sound, using the "t" in better, ...

The glottal stop, the /ʔ/ sound ... especially in American English. This sound is sometimes called a flap. It can come between vowel sounds, like in 'city' /sɪdɪ/ and 'writing' /raɪdɪŋ ...

Gonna' is very common in English. It's a shortened version of ... Watch Episode 6 here and learn about /t/, the glottal stop and the flap.