“练习”  practice
      practice  v. 练习;实习。后面多跟名词(词组)或v-ing形式作宾语。如:
      I want to practice my spoken English in the English Corner this weekend.
      这个周末我想去英语角练习口语。
      Listen! Someone is practicing playing the piano.
      听!有人在练习弹钢琴。
      practice  n. 实践;练习;经验。多为不可数名词。如:
      Practice makes perfect.  [谚]熟能生巧。
      Have you had any practice in nursing the sick?
      你有护理病人的经验吗?

                                          “决定”  decide
      decide  v.  作出决定;下决心(做某事)。后面多跟动词不定式作宾语。如:
      She decided not to go alone. 她决定不单独去。
      decide的名词形式是decision,固定搭配make a decision意为“作出决定”。如:
      She could not make a decision about the dress.
      她对(买不买)这件连衣裙下不了决心。