Vocabulary: Time – o’clock

四時 (4 o’clock)

四時 (4 o’clock) is よじ, not しじ.

4 is し when you count numbers one by one.

七時 (7 o’clock)

七時 (7 o’clock) can be しちじ or ななじ.

しち (7) is sometimes hard to say and sounds like いち (1).

So なな (another 7) is used when you want to avoid confusion between 1 and 7 at stations, airports etc.

九時 (9 o’clock)

九時 (9 o’clock) is くじ, not きゅうじ, although 9 is きゅう when you count numbers one by one.