In her family the problem is that her son began learning English when he was four, and so when he went to primary school, the English lessons were just too simple for him. And you really need small class sizes for the training of listening comprehension, and this is another thing the schools cannot provide.
她家小朋友從四歲開始學英文，學校的英文課對他來說太簡單；而聽力訓練該採小班制，學校又做不到，只好繼續送到小班制的補習班。