你一定要活在當下，不能總是留戀過去。

You must live in the present, not in the past.

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 一定要 yīdìngyào must
3 活 huó
  1. to live
  2. alive
  3. living
  4. work
  5. workmanship
4 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)
5 當下 dāngxià
  1. immediately
  2. at once
  3. at that moment
  4. at the moment
6 不能 bùnéng
  1. cannot
  2. must not
  3. should not
7 總是 zǒngshì always
8 留戀 liúliàn
  1. reluctant to leave
  2. to hate to have to go
  3. to recall fondly
=9 過去 guòqù
  1. (in the) past; former; previous
  2. to go over; to pass by
=9 過去 guòqu (verb suffix)