sometime,sometimes,some time,some times

sometime, some time, some times与sometimes 四个都可以表示时间，

它们看起来没多大区别，但用法却各不相同。

1. sometimes用作副词，表示“有的时候”，与from time to time 意思相同，可以把它放在句首，句尾或句中。sometimes是频率副词，它暗指某动作（在过去、现在或将来）有时候重复。如：

Last year he went to the city sometimes.

Sometimes he get up at seven.

I sometimes think you are wrong.

Sometimes she comes by bus and sometimes by bike.

他有时骑车来，有时乘公共汽车来。

2. sometime 用作副词。表示某个不确切或不具体的时间，表示“某个时候”，它后面应该接一个过去或将来的时间。例如：

You can hand in your homework sometime before Monday.

Tom went back home sometime last year.

We will have a meeting sometime next month.(sometime last year,sometime next month等常修饰非延续性的谓语)

另外，sometime还可以用作形容词，表示“以前的”，如：

A sometime student of yours is waiting for you at the gate.

3. some time 表示"一些时间"或“一段时间”，用作名词短语。

some time表示"一些时间”例如：

He always spends some time on his Chinese.

It took us some time to clean our house.

some time表"某一段时间"时，常常修饰延续性的谓语。如：

He'll be away for some time.

I will study in China for some time.

4. some times也用作名词短语，意为“几次，几倍”，如：

The factory is some times larger than that one.

I met him some times in the street last month.(名词词组+介词短语作时间状语) I have been to the Great Wall some times. (名词词组some times作时间状语)