coach、instruct、tutor、discipline 的差別

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coach、instruct、tutor、discipline 都有指導、訓練的意含，但是：
(1) coach 可用在指導及訓練範圍較廣，如考試、運動、歌唱．
–verb: to give instruction or advice to in the capacity of a coach; 
ex: She has coached the present tennis champion. 

(2) tutor 偏向學科方向的指導及輔導，而且有受雇當家教的意味（受教的對象只有一人）．
–verb: be a tutor to someone; give individual instruction; 
ex: She tutored me in Spanish" 

(3) instruct 具有教授、訓練、及指導的意思，而且是強調以有系統的方法來進行．
–verb: a) to furnish with knowledge, esp. by a systematic method; teach; train; educate.
b) to furnish with orders or directions; direct; order; command;
ex: The doctor instructed me to diet.

(4) discipline 具有訓練、訓導的意思，而且著重在透過下達指令、實際的練習（身體力行）來養成某種技能，或者養成自我控制、有紀律．
–verb: to train by instruction and exercise;
ex: Parents must discipline their children.