(1). force主要指自然界的力量、暴力以及法律、道德或感情的力量；(物理学的)力；军事力量The law should remain in force.

(2)/ energy主要指人的精力，(物理学的)能。He worked with great energy.

(3). strength着重指人的力气，体力。He is a man of great strength.

4. be made into / of / from / out of / in / by/ up of

be made by 由...制造

be made into 被做成...

be made of 由...做成（原料可以显而易见，制作过程是物理变化）

　be made out of 由...做成 同be made of一样

　be made from 由...做成（从成品看不出原料，制作过程是化学变化）

be made in 在...做的 （我们经常说made in China，中国制造）

be made up of=consist of 由...组成

　All the furniture here is made of /is made out of wood.

　The paper is made from straw(稻草).

　Milk can be made into butter.

5. Sauron, realizing that the Ring has been found, sends his creatures to get it back.

　realizing that the Ring has been found 现在分词作原因状语相当于: