When two forces work together, the result is more than the sum of their parts — that’s the essence of と相まって.
## What does と
天候の悪さと交通渋滞とが相まって、到着が大幅に遅れた。
The bad weather coupled with the traffic jam caused the arrival to be significantly delayed.
彼女の才能と努力とが相まって、世界的な成功を収めた。
Her talent combined with hard work led to worldwide success.
静かな雰囲気と心地よい音楽とが相まって、素晴らしい時間を過ごせた。
The quiet atmosphere together with the pleasant music made for a wonderful time.
景気の低迷と円高とが相まって、輸出企業の業績が悪化している。
The economic slump together with the strong yen is worsening the performance of export companies.
その歌手の独特な声と歌詞とが相まって、聴く人の心を深く動かす。
The singer’s unique voice together with the lyrics deeply moves the listener’s heart.
After reading each sentence, ask what job **と
📌
Implicit second factor: Sometimes the first factor is given with と相まって, and the “amplified” result itself is described without restating the combination. Context still makes the synergy clear: 景気後退と相まって、失業率が過去最悪になった (Together with the recession, the unemployment rate hit a record high — the recession and presumably other structural issues together caused the peak).
## と
と相まって
Two factors combine to amplify an effect
Use when multiple elements together produce a heightened outcome. The focus is on the synergy itself.
彼の努力と環境とが相まって、大きな成長を遂げた。
His effort combined with his environment led to significant growth.
vs
とあって
Because it is such a special condition, naturally…
Use when a reason (a notable trait, rare event) makes a result expected or inevitable. There’s no need for a second factor.
彼が天才だとあって、誰もが敬意を払う。
Because he’s a genius, everyone treats him with respect.
If you can rephrase the sentence with “simply because,” you likely want **とあって**. If you need to mention that a second ingredient was essential for the extra punch, **と
❌天気が悪いと相まって、遅刻した。
✅天気の悪さと渋滞とが相まって、遅刻した。
Attach the pattern to a noun, not a clause. “天気が悪い” is an adjective clause; you need “天気の悪さ” (a noun) or “悪天候”.
❌彼の才能と相まって、成功した。
✅彼の才能と努力とが相まって、成功した。
The pattern implies at least two factors. If only one is stated, the sentence feels incomplete—the reader wonders, “What else?” Make the combination explicit or provide enough context to make it clear.
❌景気が悪いと相まって、失業率が上がっている。
✅景気の低迷と産業構造の変化とが相まって、失業率が上がっている。
In formal writing, avoid a vague “と相まって.” Name the second contributor even if it seems obvious; it demonstrates analytical precision.
## Is と
1
Write a sentence using と相まって to describe how a restaurant’s delicious food and beautiful view together made your evening special.
daily life
2
Use と相まって in a business context: explain why a product’s low price and clever design led to record sales.
formal
3
Create a sentence that contrasts と相まって with とあって—describe the same situation twice, once with each pattern, and note how the nuance shifts.
comparison
4
Think of a famous person or character. Write a sentence where their talent and something else (luck, timing, personality) combine via と相まって to explain their success.
creative
Keep your first attempts simple. Once the structure feels natural, expand the sentence with adjectives and subordinate clauses to build the context.
## Learning path for と
1
Internalise the form – Write five noun＋と相まって phrases without looking. Ensure you always attach it to a noun, not a clause.
2
Contrast with とあって – Pick three situations and try to explain them with both patterns. Notice that と相まって demands at least two contributing factors, while とあって works with just one special quality.
3
Read real examples – Skim Japanese news articles or reviews; と相まって appears often in analyses of trends, product reviews, and cultural commentary. Highlight every instance you find.
4
Write a short paragraph – Compose a mini-essay (3–4 sentences) explaining why a book, movie, or place left a strong impression on you. Use と相まって at least twice to link multiple qualities.
## Related grammar to review next
- [とあって](/blog/n1-to-atte/) – because it also links a condition to a result, but without the synergy of multiple factors
- [とあれば](/blog/n1-to-areba/) – because it sets up a hypothetical situation leading to a reaction, useful for comparing conditional vs. combination logic
- [とばかりに](/blog/n1-to-bakari-ni/) – because it expresses “as if to say” or an implicit judgement, showing how manner can blend with causality
- [といえども](/blog/n1-to-ie-domo/) – because it acknowledges a concession, contrasting with the amplifying function of と