我明天必须买一个。

I have to buy one tomorrow.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 明天 míngtiān tomorrow
3 必须 bìxū
  1. to have to
  2. must
  3. compulsory
  4. necessarily
4 买 mǎi
  1. to buy
  2. to purchase
=5 一个 yīge
  1. a; an; one
  2. the whole (afternoon, summer vacation etc)
=5 一个 yīgè
  1. Combination of the numeral 一 (“one”) and the generic classifier 個／个: a; an; one
  2. same