1.A) We are sure that man is mortal.
B) We are sure that man is dead.
2.A) What do you want from me?
B) What do you want with me?
3.A) He threw a bone to the dog.
B) He threw a bone at the dog.
4.A) He passed by a scholar.
B) He passed for a scholar.
5.A) What is he about to speak?
B) What is he to speak about?

1. A). 我们确知人是要死的.man指人类,that是连词
B). 我们确知那人死了.that是"那个"
2. A). 你想对我要求什么?
B). 你想和我商榷什么?
want sth. from sb. 欲从某人得到某物
want sth. with sb. 欲和某人接洽某事
3. A). 他喂狗以骨头.
B). 他以骨头打狗.
A). 好意,
B). 敌意
4. A). 他以学者之名混过去了.
B). 人皆视他为学者.
pass by = be currently known by a name of
pass for = be accepted as
5. A). 他打算说什么?
B). 他预定要说的是什么?
be about to = be going to
be to = schedule