️could是can的过去式，表示：能够……,️would是will的过去式，表示：将要……
️在疑问句中，would较could委婉
Could you help me? 你能帮我吗？
Would you help me? 你会帮我吗？
️在否定句中，could较would坚决
I couldn’t help you. 我不能帮你。
I wouldn’t help you. 恐怕我帮不了你。
️ 在虚拟语气中意义不同
I could have helped you. 我本来能够帮你，却没帮你。
I would have helped you. 我本来打算帮你，但没有帮你。
