〜やすい— Easy to do / Prone to

• この本は読みやすいです。

  Kono hon wa yomiyasui desu.

  This book is easy to read.

  読み (read) + やすい (easy)

• 彼は風邪を引きやすい体質だ。

  Kare wa kaze o hikiyasui taishitsu da.

  He has a constitution prone to catching colds.

  風邪を引き (catch cold) + やすい (prone to)

• このガラスは割れやすい。

  Kono garasu wa wareyasui.

  This glass breaks easily.

  割れる (break) → 割れやすい (prone to break)

• ・Prone to Disaster: やすい isn't just for "ease of use." It heavily translates to "prone to" for negative things (壊れやすい = Prone to breaking / 忘れやすい = Prone to forgetting).
• ・Adjective Conversion: When やすい attaches to a verb, the entire word becomes an い-adjective and conjugates like one (読みやすかった).

Commonly confused with

The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones 〜やすい is tested against.

• たことがある — Have Done (Experience)
• つもりだ — Intention / Plan
• ほうがいい — Had Better / Should
• てほしい — Want someone (else) to do something
• だけで — Just by doing / With just
• ではないか / じゃないか — Isn't it? (rhetorical)
• が必要だ (がひつようだ) — Need / Necessary
• がする — Involuntary sense perception