〜やすい
Easy to do somethingmachine translation
FormationVerb ます-form (drop ます) + やすい
To say an action is "easy to do," take the verb's ます-form, drop ます, and add やすい: 読みます → 読みやすい (easy to read), 分かります → 分かりやすい (easy to understand), 使います → 使いやすい (easy to use).
After adding やすい, the whole unit behaves like an ordinary い-adjective: negative 読みやすくない, past 読みやすかった, linking 読みやすくて….
〜やすい has two nuances: "easy to do" (この靴は歩きやすい — these shoes are easy to walk in) and "prone to happen, happens easily" (割れやすい — breaks easily). The opposite pattern is 〜にくい (hard to…) — learn these two patterns as a pair.
Examples
この本は字が大きくて読みやすいです。
This book has large print, so it's easy to read.
先生の説明はとても分かりやすいです。
The teacher's explanations are very easy to understand.
この靴は軽くて歩きやすいです。
These shoes are light, so they're easy to walk in.