1. Both words are auxiliary verbs and interchangeable in many cases. 1) To master(knowledge, skill, etc.) through learning, 会 is used. (1) 他很小的时候就会游泳了。 (2) 我不会开车。 (3) 你会做这道题吗?
2) To have the ability to do sth. or to acquire certain efficiency, 能 is used. (4) 你能帮我提一下这个包吗? (5) 我恐怕不能参加这次的聚会了。 (6) 一次盛这么多饭,你能吃完吗?
3) To show great probability, 会 is used. (7) 他也许不会来了。 (8) 明天会不会下雪? (9) 你只要努力,就会取得好成绩。
2. 会 is also a verb meaning “to master, to know (knowledge, skill, etc.).” (1) 他会日语。
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