寫日記是一個好習慣。

Keeping a diary is a good habit.

Writing in a diary is a good habit.

Source: Tatoeba

Sentence Composition

=1 寫 xiě to write
=1 寫 xiè used in 寫意 xièyì
2 日記 rìjì diary

classifiers: 則, 本, 篇
=3 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)
=3 是 shì variant of 是 shì
=4 一個 yīge
  1. a; an; one
  2. the whole (afternoon, summer vacation etc)
=4 一個 yīgè
  1. Combination of the numeral 一 (“one”) and the generic classifier 個／个: a; an; one
  2. same
=5 好 hǎo
  1. good
  2. appropriate; proper
  3. all right!
  4. (before a verb) easy to
  5. (before a verb) good to
  6. (before an adjective for exclamatory effect) so
  7. (verb complement indicating completion)
  8. (of two people) close; on intimate terms
  9. (after a personal pronoun) hello
=5 好 hào to be fond of; to have a tendency to; to be prone to
6 習慣 xíguàn
  1. habit
  2. custom
  3. usual practice
  4. to be used to

classifier: 個