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Sir,

Sometimes=occasionally

Sometime=unknow time in past.

Some time=?

Some times=?

Thanks.

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Sometimes (occasionally) I eat sushi for lunch.

I'm going to Tokyo sometime next week. (nonspecific -- past or future)

I need some time to recover from my injury. (a length of time)

Some times (15th century Italy) are conducive to support of the arts, and other times (21st century US) are not.