Is it the easy way to remember to use が?


I come to my realization that I should use the particle が to introduce a new
thing that a listener does not know about (and intend to know about). For
example:

> トニー：このオープニングはいいですね。  
>  ルーシー：トニーくんの言ったことに加えて、これが私の大好きなものです。

  * Tony: This anime opening is good.
  * Lucy: In addition to that, it is my favorite part. (particle が is used).

Tony is the listener, and he doesn't know the fact about Lucy. When Lucy says
the fact, particle が is used, not particle は.

Particle が and は are very confusing. I hope someone will help me with this.
Thank you.




Since このオープニング is already introduced in the トニー's remark, you would use は and
say これは私の大好きなものです unless there are other reasons.

When you say これが…大好きなもの, it implies that it's what ルーシー likes among several
choices.

