I can't help thinking he knows more than he has told us.

　　我總覺(jué)得他沒(méi)把他知道的事全告訴我們。

　　The principal knows all the students by name.

　　校長(cháng)能叫出所有學(xué)生的姓名。

　　Everyone knows what's best for him or herself.

　　人人都知道對自己來(lái)說(shuō)什么是最好的。

　　She knows every student in the school.

　　她認識學(xué)校里的每一個(gè)學(xué)生。