Reasons for Intonation 语调变化的原因
1. New Information
It sounds like rain.
Rain is the new information. It's the most important word in the sentence.
It sounds like rain, but I don't think it is.
In this case, intonation makes the meaning the opposite of what the words say.
He likes rain, but he hates snow.
Like and hate are contrasted and are the stronger words in the sentence.
The rain didn't affect his plans, though.
Didn't negate the meanings of the following words.