你喜欢哪个就买哪个,但不能两个都买。

You can buy whichever you like, but not both.

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
2 喜欢 xǐhuan to like; to be fond of
3 哪个 nǎge
  1. which
  2. who
4 就 jiù
  1. (after a suppositional clause) in that case; then
  2. (after a clause of action) as soon as; immediately after
  3. (same as 就是 jiùshì) merely; nothing else but; simply; just; precisely; exactly
  4. only; as little as
  5. as much as; as many as
  6. to approach; to move towards
  7. to undertake; to engage in
  8. (often followed by 着 zhe) taking advantage of
  9. (of food) to go with
  10. with regard to; concerning
  11. (pattern: 就 jiù ... 也 yě ...) even if ... still ...
  12. (pattern: 不 bù ... 就 jiù ...) if not ... then must be ...
5 买 mǎi
  1. to buy
  2. to purchase
6 哪个 nǎge
  1. which
  2. who
7 但 dàn
  1. but; yet; however; still
  2. merely; only; just
8 不能 bùnéng
  1. cannot
  2. must not
  3. should not
9 两 liǎng
  1. two
  2. both
  3. some
  4. a few
  5. tael, unit of weight equal to 50 grams (modern) or 1⁄16 of a catty 斤 jīn (old)
=10 个 gě used in 自个儿 zìgěr
=10 个 gè
  1. (classifier used before a noun that has no specific classifier)
  2. (bound form) individual
=10 个 gè variant of 个 gè
=11 都 Dū surname Du
=11 都 dōu
  1. all; both; entirely
  2. (used for emphasis) even
  3. already
  4. (not) at all
=11 都 dū
  1. capital city
  2. metropolis
12 买 mǎi
  1. to buy
  2. to purchase