sometimes

sometimes, sometime, some time

这一组词都是与时间相关的副词。
sometimes: 是个频度副词，意为“有时”，表示动作发生的不经常性，常与一般现在时或一般过去时连用。

• sometimes i have lunch at school.
  有时我在学校吃午饭。

sometime: 是个副词，意为“某时”，指时间上不确定的某一点，常用于过去时或将来时。

• i saw him sometime in july.
  七月有一天我曾见到过他。

some time: 是个名词短语，意思是“一段时间”，在句中常与for，take等词连用。

• i'll stay here for some time.
  我将在这儿呆一段时间。

副词 sometimes:

1. on certain occasions or in certain cases but not always

1. Good student as he is (=Though he is a good student), he sometimes makes mistakes.
   虽然他是好学生，偶而也会犯错。
2. Mr. Smith sometimes condescends to help his wife with the housework.
   史密斯先生有时屈尊帮他的妻子做家务。
3. Love is sometimes put in range with a career.
   人们往往认为爱情和事业是并驾齐驱的。
4. The vowels in the English alphabet are a, e, i, o, u, and, sometimes, y.
   英语的元音字母有a，e，i，o，u，有时也包括y。
5. Sometimes the patient cried for the pain.
   有时这个病人疼得哭起来。