有人问到一道填空题：

(1)He's very old, and his_________are getting slower and slower.

答案为movements,请问为何不用movement?

抽象名词movement（动作）有可数不可数之分。用作不可数名词，如：

(2)He stood there without movement .

(3)For a long time after the accident, he had no movement in his legs.

用作可数名词，如：

(4)His movements are easy and dignified.

(5)When people shiver, their uncontrolled muscular movements produce heat and so keep them warm.

由于上述句子所表的是身体的具体动作，所以应用可数的复形名词movements。