Sometimes บางครั้งบางคราว (Certainty)
– On certain occasions instead of all the time.
ตัวอย่าง
Sometimes I go shopping in the end of the week.
Sometimes I pick up dinner from Japanese restaurant.
Sometimes I wish I had completed university.

Sometime บางเวลา แต่ไม่ทราบระยะเวลาที่แน่นอน (Uncertainty)
– At an unknown time or place in the past or future.
ตัวอย่าง
Jack got married sometime last year.
I would like to visit Italy sometime next year.
I would like to visit England sometime in my life.