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sometimes，sometime，some times和some time这四个词相似度很高，极易混淆。通常词性决定用法，下面我通过词性和具体实例来区分它们。

一、sometimes是个频率副词，意为“偶尔，有时候”，修饰谓语动词作状语。它的位置在be动词、情态动词或助动词之后，行为动词之前，有时候也出现在句首。例如:

He is sometimes late for school.

Tom sometimes plays soccer in the park.

Sometimes Tom plays soccer in the park.

二、sometime是个时间副词。我们可以把它和不定代词someone联系起来记忆，someone意为“某个人”，那么sometime就是“某时”的意思，多用于将来时。例如:

We will plant some trees here sometime.

Bob wants to visit Paris sometime next summer.

三、time是名词，如果它作为可数名词，即“次数、倍数”。some times当中的time加了s，说明此处它就是可数名词，那么some times就是“几次”的意思，表示动作频率。例如:

She took my phone by mistake some times.

Grace has been to England some times.

四、time还可以作为不可数名词，即“时间”。some time当中的time没有加s，说明此处它就是不可数名词，那么some time就是 “一段时间”的意思，表示动作的持续时间。例如:

The heavy snow has lasted for some time.

Tony stayed in the train station for some time.

在区分单词用法时，我们首先要从词性入手，看它属于哪个词类，然后再到具体的例句中分析它的作用，一切就会变得简单起来。