Work begins at seven thirty.为什么 begins 要加S

Work begins at seven thirty.为什么 begins 要加S He begins to work at seven.该一般疑问句） The film begins at half past seven. begins the at cartoon seven evening in the 造句 一道初一英语短文填空The first lesson begins at eight .So I must get t______ at seven forty.In China ,a lot of p____ go to work on their b______ and you can see bikes h_______ and there. Every day he begins to do his homework____ A.at ten past seven B.at seven past ten 为什么? Every day he begins to do his at ten past seven Every day he begins to do his at ten past It's t（ 1 ） to go to school at seven thirty.She begins to h( 2 )classes at eight . He begins working at eight thirty.改为同义句He ------- work at -------- --------- eight. my mother goes to work at a____ seven Every day he begins to do his homework ___1on ten past seventh 2 in seven ten 3 at ten past seven 4until ten 说明原因 I am busy in the computer company.Work begins at one thirty in the afternoon. she begins to work at 8;00 every morning改为同义句 she begins to work at 8;00 every morning 怎么改为同义句? Class begins at?是什么意思? Charity begins at home. 帮朋友提问：l've got two tickets (　 )the flower show .it begins ( )seven.A.at,for B.for,at C.on,to D.at,to the boy's father goes to work at seven twenty就划线部分提问!划线部分是at seven twenty!