常に

1. Origins, structure, and basic meaning

• Structure: Spelling: 常に. Reading: つねに. Core meaning: always; constantly.
• Basic usage: Representative examples: 彼女は常に予備の鉛筆を持っている / 舞台では常に周りの動きを意識した.

2. Common pitfalls and similar expressions

• Strength of a frequency adverb
  • 常に is a strong frequency expression meaning continuously or at every relevant time without exception. Its scope is broader than よく, often.