不仅……也 / 还 / 而且……
bùjǐn… yě / hái / érqiě…
Meaning
不仅……也 / 还 / 而且…… means “not only…, but also…”. It says that besides what the first clause states, there is a further fact, quality or action.
不仅 A, 也 / 还 / 而且 B → Not only A, but also B.
1. Same subject
When both clauses share a subject, 不仅 goes AFTER it.
Subject + 不仅 + A, 而且 / 也 / 还 + B
他不仅足球踢得好，性格也不错。
He not only plays football well, but also has a good personality.
Both halves here have 他 as subject, so 不仅 follows it: 他 + 不仅 + A, B + 也……
我不仅会说中文，还会说英文。
I not only speak Chinese, I speak English as well.
2. Different subjects
When the two clauses have different subjects, 不仅 goes BEFORE the first one.
不仅 + Subject 1 + A, Subject 2 + 也 / 还 + B
不仅我会说中文，我朋友也会说中文。
Not only do I speak Chinese — my friend speaks it too.
The two side by side
我不仅学中文，还学英语。
I study not only Chinese but English too. (Both actions are 我's.)
不仅我学中文，我哥哥也学中文。
Not only do I study Chinese — my elder brother does too. (Subjects: 我 and 我哥哥.)
| Ega bir xil | Egalar har xil |
|---|---|
| S + 不仅……也 / 还 / 而且…… | 不仅 + S1……, S2 + 也 / 还…… |
| 不仅 AFTER the subject | 不仅 BEFORE the first subject |
| 我不仅学中文，还学英语。 | 不仅我学中文，我哥哥也学中文。 |
3. 也 vs. 还 vs. 而且
All three work with 不仅, but the flavour differs.
他不仅会中文，也会俄语。
He knows Chinese and Russian too. (也 — a neutral addition.)
他不仅会中文，还会俄语。
He knows Chinese — and Russian on top of that. (还 presses the addition harder.)
他不仅会说中文，而且说得很流利。
He not only speaks Chinese — he speaks it fluently.
Note: here 而且 adds not a second thing but a second DEGREE — “speaks” becomes “speaks fluently”.
When the addition is unexpected
小时候，他经常生病，所以每天都去跑步锻炼身体。
As a child he was often ill, so every day he went running to build himself up.
谁也没有想到，长大以后，他不仅身体健康，还成了一名长跑运动员。
Nobody expected that, grown up, he would not only be healthy but become a long-distance runner.
This is 还 doing its real work: the second half is more surprising than the first.
When two qualities are added
我打算去云南玩儿，听说那边不仅很美，而且人也非常热情。
I'm planning a trip to Yunnan. They say it isn't only beautiful — the people are very warm as well.
而且 can be followed by 也 as well: 而且人也非常热情.
Remember:
不仅 = not only; 也 = also; 还 = in addition; 而且 = moreover.
Same subject → 不仅 AFTER it.
Different subjects → 不仅 BEFORE the first.