since: [15] Since is a contracted form of Middle English sithenes ‘since’. This in turn went back (with the addition of a final -s) to Old English siththan, a compound adverb and conjunction formed from sīth ‘after’ (a relative of German seit ‘since’) and thām ‘that’.
since (adv.)
early 15c., synnes, from sithenes "since," from sithen (plus adverbial genitive -es), from Old English siððan "afterward, from now on, hereafter, further, later, as soon as, after that," originally sið ðan "after that," from sið "after" (see sith) + ðan, weakened form of ðam, dative of ðæt (see that).
As a conjunction from late 14c.; as a preposition from 1510s; "from the time when," hence "as a consequence of the fact that." Modern spelling replaced syns, synnes 16c. to indicate voiceless final -s- sound. Since when? often expressing incredulity, is from 1907.
实用例句
1. Since the birds interbreed they cannot be classed as different species.
由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。
来自柯林斯例句
2. I've had the hots for him ever since he came to college.
自从他来上大学后，我就对他春心萌动。
来自柯林斯例句
3. "Prices are down 40 per cent since Christmas," he lamented.
“圣诞节以来物价降了4成，”他悲叹道。
来自柯林斯例句
4. The mechanics of the job, however, have changed little since then.
不过，工作流程从那以后就几乎没有任何变化。
来自柯林斯例句
5. Rock'n'roll has become so commercialised and safe since punk.