Every day he starts work at 8:00am and finishs work at 4:30p

Every day he starts work at 8:00am and finishs work at 4:30pm.这句话中work 后面跟at对吗?还是用starts working 8：00 am?还是两种表达方式都对?
我用WORD检查：Every day he starts work at 8:00am and finishes work at 4:30pm.和 Every day he starts working 8:00am and finishes working 4:30pm.都没有绿色下划线出现，是不是表示这两种表达方式都可以呢？