At a glance
よく + verb usually means "often". With some verbs, such as 分かる and 寝る, and in requests like よく洗ってください, it means "well" in the sense of "thoroughly".
よく + Verb
よく映画を見ます。 I often watch movies.
How to form it
よく is an adverb. It comes before the verb, and its meaning depends on the verb:
| Meaning | Used with | Example |
|---|---|---|
| Often | Most action verbs: 行く, 見る, 食べる, 話す | よく映画を見ます。 "I often watch movies." |
| Well, thoroughly | 分かる, 知っている, 見える, 寝る | よく分かりました。 "I understood well." |
| Well, thoroughly | Requests: よく洗って, よく考えて | よく考えてください。 "Please think carefully." |
よく can come before the object or right before the verb. よく映画を見ます and 映画をよく見ます are both correct.