英作文で『The first reason is that』を使っても良いですか？

不自然に長くなりやすいため、英検の短い字数では避けるのが無難です。代わりに “First,” “Firstly,” “The main reason is …” など簡潔な導入を推奨します。

『First,』『Firstly,』『First of all,』の後にカンマは必要？

文頭に置くディスコース・マーカーとして使う場合は “First,” “Firstly,” “First of all,” のようにカンマを置きます。

カンマを置く接続詞／置かない接続詞（英検ライティング）

要点文頭で段落の論理を示す語句（However, / Therefore, / First, など）は ディスコース・マーカーとしてカンマを置くのが基本。節を導く接続詞（because / although / if など）は 接続詞の直後にカンマを置かないのが基本です。

カンマを置く接続詞（文頭のディスコース・マーカー）

接続詞（句）	説明	例文
First,	第1の論点	First, education broadens opportunities.
First of all,	第1の論点（やや強調）	First of all, we should clarify our goal.
Firstly,	第1の論点（英検でも可）	Firstly, the plan reduces costs.
Second,	第2の論点	Second, it saves time for users.
Secondly,	第2の論点（英検でも可）	Secondly, it is easy to implement.
Finally,	最後の論点・結語	Finally, we must consider long-term effects.
Lastly,	最後の論点	Lastly, the benefits outweigh the risks.
However,	逆接・対比	However, it is not always successful.
Therefore,	結果・結論	Therefore, we should take action now.
Moreover,	追加の情報	Moreover, it saves time and money.
In addition,	追加の理由	In addition, it improves communication.
Furthermore,	加えて（ややフォーマル）	Furthermore, the policy benefits all citizens.
By doin so,	そうすることで	By doing so, students can study more.
Consequently,	結果として	Consequently, many lost their jobs.
As a result,	結果として	As a result, the town became cleaner.
For example,	例示	For example, Japan has a long history of innovation.
For instance,	例示	For instance, many use apps to learn languages.
On the other hand,	対比・逆の立場	On the other hand, some disagree strongly.
In fact,	強調・具体化	In fact, the results were better than expected.
On the contrary,	逆の内容を述べる	On the contrary, it made things worse.
Nevertheless,	それにもかかわらず	Nevertheless, she continued her research.
That said,	前言を受けた逆説	That said, the idea still has merit.
In other words,	言い換え	In other words, it’s not effective.
To sum up,	要約	To sum up, we should act quickly.
In conclusion,	結論	In conclusion, education is the key.
In short,	要約・簡潔に	In short, it was a success.
Above all,	最重要点	Above all, health must be prioritized.
To begin with,	導入	To begin with, let’s define the issue.

（接続詞の直後に）カンマを置かない接続詞

接続詞	説明	例文
If	条件	If you study hard, you will succeed.
When	時間・条件	When the bell rings, class begins.
The first reason is that	that節	The first reason is that people spend too much money.
While	対比・同時	While I was eating, he called.
Although	譲歩	Although it rained, we went out.
Because	理由	Because he was late, he missed the bus.
Since	理由・時間	Since it’s cold, wear a jacket.
As	理由・時間	As I was tired, I went to bed early.
Before	時間	Before you leave, lock the door.
After	時間	After the game ended, we went home.
Though	譲歩	Though he tried, he failed.
Even though	強い譲歩	Even though it’s hard, I enjoy it.
Unless	条件（〜しない限り）	Unless you hurry, you’ll miss it.
Once	〜したらすぐ	Once you finish, take a break.
Whenever	〜するたびに	Whenever I see her, I smile.
Now that	〜なので（理由）	Now that he’s here, we can start.
This is because	理由説明	This is because they lack support.
Provided that	条件	Provided that it’s safe, we’ll go.
Even if	仮定の譲歩	Even if it rains, we’ll go hiking.
Whereas	対比	Whereas I prefer tea, he likes coffee.
Whether	選択・条件	Whether you agree or not, we must act.

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