一般來講，several days 不超過一週。a few days 時間跨度要大些。
A few days =several days =some
Several 修飾可數或不可數，都可以
A few 修飾可數名詞
“幾月幾日”用英語:A few months and days＂
相關例句: daily use，the date can also in clude the month and the day
some adj. 一些，若干
帶有不確定性，多用於肯定句中，後接複數可數名詞或不可數名詞。
例：Some co-workers attended his party.
一些同事參加了他的聚會。
several adj. 幾個，數個
一般只能用於肯定句，強調“不止一兩個”，後接複數可數名詞。
例：She raises several pigs.
她養了好幾頭豬。
