自然

1. Origins, structure, and basic meaning

• Structure: 自然 (しぜん) is a word functioning both as a noun for the natural world and as a na-adjectival expression for natural manner.
• Basic usage: 豊かな自然に触れる refers to the natural environment in the mountains, while 自然に話す adverbially describes speaking without awkwardness even to a new guest.

2. Common pitfalls and similar expressions

• Separate the noun from the adverbial form
  • In 自然に触れる, the noun 自然 is followed by に to mark the object of contact; in 自然に話す, the sequence describes how someone speaks. The same written sequence has different functions.