Explanation
Use "good" for a person, thing, or state. Use "well" for the way an action happens, or for health.
For example, "She sings well." Here "She" is the subject, "sings" is the action, and "well" tells us how she sings. In Japanese, you may just say "歌が上手です," but English needs "well" after the verb. For a description, say "She is a good teacher." Here "is" links the subject to the description "a good teacher."
"good" は人、物、状態を表すときに使います。"well" は動作のしかたや、体調を表すときに使います。
例えば "She sings well." では、"She" が主語、"sings" が動作、"well" が「どのように歌うか」を表します。日本語では「歌が上手です」と言えますが、英語では動詞の後に "well" を置きます。説明をするときは "She is a good teacher." のように言います。ここでは "is" が主語と説明をつなぎ、"a good teacher" が彼女の説明です。
Examples
- This soup is good. このスープはおいしいです。
- She is a good friend. 彼女はいい友達です。
- He speaks English well. 彼は英語を上手に話します。
- Do you sleep well? よく眠れますか。
- I do not feel well today. 今日は気分がよくありません。
- He is good at football, and he plays well in matches. 彼はサッカーが得意で、試合でもうまくプレーします。
Common Mistakes
Japanese learners often say "I speak English good." The correct form is "I speak English well." After a verb, use the adverb "well." If you want to say skill, you can also say "I am good at English."
日本人学習者は "I speak English good." と言いがちです。正しくは "I speak English well." です。動詞の後では副詞の "well" を使います。能力を言いたいなら "I am good at English." も使えます。