Questions & Answers about kore wa himitsu desu.
Because when は is used as the topic particle, it is pronounced wa, not ha.
So in これは秘密です, you read it as:
But when は is part of a word, it is usually pronounced ha.
This is a very common thing in Japanese, and learners just have to memorize it:
- は as a particle → wa
- は inside regular words → usually ha
