因而
therefore; as a result (written)
Structure
原因 ， （主语） 因而 结果
What it means
“Therefore, as a result”: the written partner of 所以, linking a cause to its result inside one sentence.
How it is built
Cause，因而 + result, or subject + 因而 + verb: 由于他平时很注意锻炼，因而很少生病 (because he keeps fit, he is rarely ill). 近视的人数因而不断增加.
When to use it
Written; in speech say 因为…，所以…. It pairs naturally with 由于 (由于…，因而…) and opens the second clause after a comma.
Watch out
Don’t start a new sentence or paragraph with it after a full stop; use 因此 there: ✗ …。因而，… ✓ …。因此，…
Examples
这条路晚上没有路灯，光线不足，因而经常发生交通事故。
There are no street lights on this road at night and visibility is poor, so accidents are frequent.
由于他平时很注意锻炼，因而很少生病。
Because he takes care to keep fit, he is rarely ill.
孩子们在户外的时间越来越少，近视的人数因而不断增加。
Children spend less and less time outdoors, and the number of short-sighted children keeps rising as a result.
Learn this in Lesson 18 · HSK 5: “小眼镜”越来越多 (Why so many children wear glasses)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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