四月

1. Origins, structure, and basic meaning

• Structure: 四月(しがつ) means April, the fourth month of the calendar year.
• Basic usage: It is used for the timing of a new job or seasonal changes in spring.

2. Common pitfalls and similar expressions

• A month name versus a duration
  • 四か月(よんかげつ) expresses a duration of four months. The month name 四月 uses し, while counting the duration uses よん.