汤姆是一个大嘴巴。

Tom has a pretty big mouth.

Source: Tatoeba

Sentence Composition

1 汤姆 Tāngmǔ Tom (name)
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
=3 一个 yīge
  1. a; an; one
  2. the whole (afternoon, summer vacation etc)
=3 一个 yīgè
  1. Combination of the numeral 一 (“one”) and the generic classifier 個／个: a; an; one
  2. same
4 大嘴巴 dàzuǐba
  1. bigmouth
  2. blabbermouth