Good Q. some time: 1 a period. 2 a specific time in future (not the past or now, but only future) sometime: They rarely use this word, meaning 1 a specific time in the past (adverb/adjective) 2 a specific time in the future as "some time". some times: several times, eg, you tried 10 times, you could say "I tried some times". sometimes: the most often used one, meaning at times, now and then, etc

sometimes 副词，意思是有时；sometime副词，意思是在（将来或过去）某个时候；some time是名词短语，意思是一段时间；some times意思是几次！