❶（私たち[あなた（たち）, 彼ら]は）～である ⦣ areは主語がwe, you, theyまたは複数名詞の時のbeの現在形.
We are Japanese.
♔基本We are Japanese.
私たちは日本人です.
⦣ We are＋形容詞.
You are beautiful.
You are beautiful.
君（たち）は美しい（です）.
These flowers are very beautiful.
These flowers are very beautiful.
これらの花はとても美しい（です）.
They are [They're] brothers.
♔基本They are [They're] brothers.
彼らは兄弟です.
⦣ They are＋名詞. we are, you are, they are などは話し言葉ではしばしば we're, you're, they're のように縮めていう.
Tom and Huck are good friends.
Tom and Huck are good friends.
トムとハックは仲良しの友達です.
Are you happy?
♔基本Are you happy?
君は幸せですか.
⦣ 疑問文ではAre you [we, they] ～? となる.
You are not a child.
♔基本You are not a child.
君は子供ではない.
⦣ 否定文ではYou [We, They] are not ～. となる.
Are you students at this school?—Yes, we are.
会話Are you students at this school?—Yes, we are アー.
君たちはこの学校の生徒ですか.—はい, そうです.
⦣ we areの後ろを省略した形の時はareを強く発音し, ×we'reという短縮形は使わない.
＊会話＊
Are they American?—No, they aren't. They are British.
彼らはアメリカ人ですか.—いいえ, そうではありません. 彼らはイギリス人です.
⦣ aren't＝are not.
You are lucky, aren't you?
You are lucky, aren't you?
君（たち）はついてますね.
⦣ ～, aren't you? は「～ですね」と念を押おす用法. 次の ～, are you? も同じ.
You aren't a spy, are you?
You aren't a spy, are you?
君はスパイじゃないでしょうね.
I'm sick.—Oh, are you?
会話I'm sick.—Oh, are you?
私は具合が悪いのです.—おや, そうですか.
