deal
Teachers should deal fairly with their pupils. 此句中deal用作不及物动词,常和with连用,意为“对待”,这是deal的常用法。deal还有其它用法。如:
①She spent a good deal of money on new clothes. (a good deal of意为“很多,大量”。)
②We tried to make sure everyone got a fair deal. (a fair deal意为“公平的待遇”。)
③My bank deals in stocks and shares now. (deal in意为“经营”。)
④The teacher dealt out the test papers to the students. (deal out意为“分发”。)

cause
She’s always causing trouble. 此句中cause用作及物动词,意为“使发生,引起”,这是cause的常用法。cause还有其它用法。如:
①Smoking is one of the causes of heart disease. (cause用作可数名词,意为“原因,理由”。)
②People fought for the cause of freedom and peace. (cause用作名词,意为“事业,目标”。)