Reflection: I found that I often spoke everything without intonation, like a robot. I was focusing so hard on grammar and word choice that my brain had no energy left for pitch.
To solve the problem:
1.stress the content words (nouns, main verbs, adjectives, negatives)
❌ Robot: "I am going to the store to buy some milk." (all words equal)
✅ Natural: "I am going TO the STORE to BUY some MILK." (stretch the bold ones)
2.find the melody
I found that some lectures sounds boring is because the speakers don't have melody in their sentences. Different emotions lead to different melodies.
in this audio i still stressed "the" ...