In English there are many ways to say before, it depends on context and what you are referring to. Here are some examples:-
1. She had to rest BEFORE dinner.
2. PRIOR to having her dinner, she rested.
3. PREVIOUS TO having her dinner she rested.
4. She rested IN ADVANCE OF dinner.
5. The PRELUDE to the movie got me interested in seeing it.
「～の前」の言い方はいろいろあります。どう表現するかは文脈によります。
以下、例文です。
1. She had to rest BEFORE dinner.（彼女は夕食の前に少し休んだ）
2. PRIOR to having her dinner, she rested.（彼女は夕食の前に少し休んだ）
3. PREVIOUS TO having her dinner she rested.（彼女は夕食の前に少し休んだ）
4. She rested IN ADVANCE OF dinner.（彼女は夕食の前に少し休んだ）
5. The PRELUDE to the movie got me interested in seeing it.（映画のオープニングを見て面白そうだなと思った）
The word previously means "to have already taken place", such as " I now live in New York, but previously lived in London".
The second phrase sounds a little more formal and precise, as in 'prior to living in New York, I lived in London".
The third phrase, "in advance of" would not really work for the above two instances, and is more likely to be seen in a way like this - "in advance of our meeting, I need to study the agenda".
"previously" は「既に起こった」という意味です。
例：
"I now live in New York, but previously lived in London".
（私は今ニューヨークに住んでいますが以前はロンドンに住んでいました）
二つ目のフレーズはよりフォーマルで、「正確」なニュアンスです。
例：
"Prior to living in New York, I lived in London".
（ニューヨークに住む前はロンドンに住んでいました）
三つ目のフレーズ "in advance of" は、上の例のように使うことはできません。これは次のように使えます。
"In advance of our meeting, I need to study the agenda".
（ミーティングの前に、議題について調べないといけない）
"Before."
This means during an earlier time. For example, "before working as an English teacher, I worked as a translator."
"Previously."
This refers to something that happened before something else. For example, "she was previously employed by the council."
"Prior to (something)"
This also means 'before' but has to precede a noun or gerund. For example, "prior to working in the entertainment industry, he worked in finance."
"Before."
これは「〔時間的に〕～の前に」という意味です。
例えば：
"Before working as an English teacher, I worked as a translator."（英語教師になる前は、翻訳家をしていました）
"Previously."
これは「一つ前の出来事」を表します。
例えば：
"She was previously employed by the council."（彼女は以前は議会で働いていました）
"Prior to (something)"
これは 'before' と同じ意味ですが、この後には名詞または動名詞が続きます。
例えば：
"Prior to working in the entertainment industry, he worked in finance."（芸能界に入る前、彼は金融の仕事をしていました）
こんにちは。質問ありがとうございます。
「前」、「先」という意味の「ビフォー」はbeforeです。
例
17時前までに取りに来てください。
Please come pick it up before 5 P.M.
例 （並んでいて）
先に行っていいですよ。
You can go before me.
例
映画観る前に夕食を食べよう。
Let’s have dinner before seeing the movie.
またの質問をお待ちしてます。
Before has two different uses in English, as preposition and subordinating conjunction.
Preposition - before can be used as a preposition together with a noun to form a prepositional phrase placing something in time.
Example: I need to be at work before 8.
Subordinating conjunction - before can also be used as a coordinating conjunction to join together two clauses, putting one earlier than the other in time. Each clause has its own subject and verb.
Formula: [clause A] before [clause B].
Example: I brushed my teeth before I went to bed.
Before' は、前置詞または従位接続詞として用いられます。
前置詞 - 前置詞の 'Before' は、名詞とともに前置詞句を成し、時間の前後を表します。
例: I need to be at work before 8.（8時前に会社に行かないといけない）
従位接続詞 - 従位接続詞の 'Before' は二つの節をつなぎ合わせ、時間の前後を表します。それぞれの節に主語と動詞があります。
型: [節 A] before [節 B]
例: I brushed my teeth before I went to bed.（寝る前に歯磨きをしました）
1. Prior means coming before
She was late because she had a prior engagement.
An engagement is another word for an appointment
or meeting.
2. Pre- This also means before and is commonly used
with a hypen as a prefix to form the first part of a hyphenated word.
They had some pre-drinks at the bar before the start
of the dinner.
3. Before means what happens earlier or precedes another event.
He completed the marathon well before the other athletes.
1. "Prior" は「前の／先の」という意味です。
She was late because she had a prior engagement.
（彼女は約束があったので遅れました）
"Engagement" は「約束／会合」を指します。
2. "Pre-" これも「前の」という意味です。ハイフンとともに、接頭辞として使われます
They had some pre-drinks at the bar before the start of the dinner.
（彼らはディナーの前にバーで少しお酒を飲んでいた）
3. "Before" は「～の前に」という意味です。
He completed the marathon well before the other athletes.（彼は他の参加者よりずっと早くマラソンを完走した）
I need to practice my English, before I go to work.
I will text you before I arrive.
The word "before" is used to to describe something that happens or will happen in advance of another event.It is often used to compare things after time, a "before" and "after" photo of a development project or person losing weight or having a haircut.
The opposite of 'after' is 'before'. Of course, this preposition may be further elaborated by using an adverb such as 'shortly' or 'immediately'.
Eg. 'The President was shot shortly before 10am local time.'
after' の反意語は 'before' です。もちろん、'shortly' や 'immediately' などの副詞を使って、この前置詞をさらに詳しく説明することもできます。
例：
'The President was shot shortly before 10am local time.'（大統領は現地時間午前10時少し前に撃たれました）
The word, "before," ( be four ) is the word that we can use to mean the opposite to after. This refers to all the moments that happened before a mentioned instance or action.
Example sentence :
- Before I started working for Google, I worked for IBX.
Here we can also use the word, "previously."
"before"（発音＝be four）は "after"（意味＝～の後）の反対の意味の言葉です。
"before" は「～の前」という意味です。
例文：
- Before I started working for Google, I worked for IBX.（Googleに勤める前、IBXで働いていました）
Before (during the period of time preceding ) will be the best option here because it's a direct opposite word to "after". For example - He asked this question before she started to cry
これは "Before"（～の前に）と言えます。"Before" は "After" の直接の反意語です。
例：
He asked this question before she started to cry
（彼は彼女が泣き出す前にこの質問をしました）
こんにちは。
ビフォーアフターなどで使われる「ビフォー」は英語でもそのまま before と言います。
ちなみに「アフター」は after です。
下記は例文ですのでぜひ参考にしてください。
Can you come to the office before 9 tomorrow?
明日は9時前にオフィスに来てくれますか？
The antonym for after is "before" and "preceding". You may use these words in a sentence in the following ways:
-We usually look at sales figures from the preceding year to plan for sales in the current year.
-I was fat before I started working out.
カナダ 
イギリス 
アメリカ合衆国 
南アフリカ 
