要是去北京的话，一定要看一下天安门广场。

If you go to Beijing, definitely have a look at Tiananmen Square.

Source: Tatoeba

Sentence Composition

1 要是 yàoshi (coll.) if
2 去 qù
  1. to go
  2. to go to (a place)
  3. (of a time etc) last
  4. just passed
  5. to send
  6. to remove
  7. to get rid of
  8. to reduce
  9. to be apart from in space or time
  10. to die (euphemism)
  11. to play (a part)
  12. (when used either before or after a verb) to go in order to do sth
  13. (after a verb of motion indicates movement away from the speaker)
  14. (used after certain verbs to indicate detachment or separation)
3 北京 Běijīng Beijing municipality, capital of the People's Republic of China (abbr. to 京 Jīng)
4 的话 dehuà if (coming after a conditional clause)
5 一定要 yīdìngyào must
=6 看 kān
  1. to look after
  2. to take care of
  3. to watch
  4. to guard
=6 看 kàn
  1. to see; to look at
  2. to read
  3. to watch
  4. to visit; to call on
  5. to consider; to regard as
  6. to look after
  7. to treat (a patient or illness)
  8. to depend on
  9. to feel (that)
  10. (after a verb) to give it a try
  11. to watch out for
7 一下 yīxià
  1. (after a verb) a bit; a little (indicating brief duration, or softening the tone, or suggesting giving sth a try)
  2. all at once; suddenly
=8 天安门广场 Tiānānmén Guǎngchǎng Tiananmen Square
=8 天安门广场 Tiān'ānmén Guǎngchǎng Tiananmen Square (a plaza in Beijing, China)