The document discusses the interchangeability of the words "so" and "too" in sentences. It states that they can be used interchangeably when the sentence is an interjection expressing strong feeling, but in most other cases they cannot be substituted. Examples are provided where "so" or "too" would be appropriate depending on whether the sentence is expressing a feeling or making a comparison.

1. so / too
so=とても
too=十二分／十分すぎる In some cases it can mean とても。
Sometimes so and too can be used interchangeably(動議に使える). Sometimes they
cannot. So and too CAN be used interchangeably when the sentence is an interjection
(感嘆時). In most other cases it cannot.
1) Maru is _____ cute! ( so / too / どちらでもいい)
2) Maru is _____ big to fit in this box. ( so / too / どちらでもいい)
3) Maru is _____ popular that he has his own fan club. ( so / too / どちらでもいい)
4) Maru is _____ popular! ( so / too / どちらでもいい)
5) Maru likes boxes a little _____ much. It’s unusual for a cat. ( so / too / どちらでもいい)