在一天之内完成它几乎是不可能的。

It's next to impossible to finish it in a day.

Source: Tatoeba

Sentence Composition

1 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
2 一天 yītiān
  1. (colloquial) the whole day
  2. one day (twenty-four hours)
  3. someday; one day
  4. the entire daytime of one day
  5. the whole day
3 之内 zhīnèi inside; within
4 完成 wánchéng to complete; to accomplish
=5 它 tā it
=5 它 tā it (pronoun for an animal)
=5 它 tuō
  1. alternative form of 駝 /驼 (tuó)
  2. used in 它它藉藉／它它借借
=5 它 yí only used in 它它
6 几乎 jīhū almost; nearly; practically
=7 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)
=7 是 shì variant of 是 shì
8 不可能 bùkěnéng
  1. impossible
  2. cannot
  3. not able
=9 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂兒的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=9 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=9 的 dí really and truly
=9 的 dì (bound form) bull's-eye; target