[求助]each的用法

我知道在以下用法中动词用单数：Each boy has to take one. 　　Each of the boys has to take one.

那请问 Companies O and P each have the same number of employees。。。这句话正确不呢？each用在后面的时候，动词该用单数还是复数呢？

谢谢。

刚正好见过，http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=106073&id=15663&skin=0

第九楼

多谢！！我把它粘过来

The traditional rule holds that when the subject of a sentence begins with  each, it is grammatically singular, and the verb and following pronouns must be singular as well:
Each of the suites has (not  have)  its (not  their)  own private entrance (not  entrances).

When  each follows a plural subject, however, the verb and subsequent pronouns remain in the plural: The suites each have their own private entrances (not  has its own private entrance).

An exception is made when  each follows the verb with a first-person plural subject: one may say either  We boys have each our own roomor.  We boys have each his own room, though the latter form is somewhat stilted in modern use.

· The expression  each and every is likewise followed by a singular verb and singular pronoun in formal style:
Each and every driver knows (not  know)  what his or her (not  their)  job is to be.