前缀be- = about,completely;to make ;to provide with
汉：来源于盎格鲁-撒克逊语，主要意思为"make"加强语气,作动词前缀。此外，前缀be还有介词"by"的含义，可构成名词、连词和副词。
在本族语词缀中，派生前缀be-的用法是较为复杂的，在古英语中，be-是介词by的弱读形式，它的基本意思是about或around,主要的引申义有completely（表示加强词义）。be-的属性有两种：1）介词性或副词性前缀。这时，它可以帮助构成像beside,between这样的介词，也可以加在动词上表示加强词义或构成及物动词。2）动词性前缀。这时，它可以加在名词或形容词上，意为to make 或to cause to be。如果加在物质名词上，be-还可以表示to provide with 的意思。在少数情况下，be-表示to make..off 的意思。
英：word-forming element with a wide range of meaning: "thoroughly, completely; to make, cause seem; to provide with; at, on, to, for," from Old English be- "on all sides" (also used to make transitive verbs and as a privative or intensive prefix), from weak form of Old English bi "by," probably cognate with second syllable of Greek amphi, Latin ambi and originally meaning "about" (see ambi-).
This sense naturally drifted into intensive (cf. bespatter "spatter about," therefore "spatter very much"). Be- can also be privative (cf. behead), causative, or have just about any sense required. The prefix was productive 16c.-17c. in forming useful words, many of which have not survived, e.g. bethwack "to thrash soundly" (1550s), betongue "to assail in speech, to scold" (1630s).
1.befall
v. happen or occur遭遇，发生
例句:You never know when misfortune might befall you.你永远不知道不幸什么时候可能会降临到你身上。
2.beguile
v.cheat,amuse 诱骗；使高兴
例句：Thousands of elderly couples were beguiled into selling their homes for far less than market value by the scrupulous real estate agency.数千名老人在别有用心的房地产中介公司的诱骗下，以远远低于市价格卖掉了自己的房子。
3.behead
v.cut off the head 砍头
例句：One passenger was beheaded when he was fung from the bus as it fumbled down the hill.当汽车滚向山下时，一位乘客被甩了出去，脑袋搬了家。
4.beseech
v.ask earnestly or urgently 哀求，恳求
例句：I beseech you to help us get our land back.恳求您帮我们赎回我们的土地。
5.beset
v.close in on all sides包围；困扰
例句：Only a small portion of the old market remains,and it is beset by high-rise office buildings.那个旧市场里只有很小的一部分保存了下来，而且四周被高耸的商务楼包围着。
6.betroth
v.engage a woman in contract of marriage订婚
例句：They were betrothed in May and married in June without ever having met.从末谋面的他们于5月订婚，6月完婚。