could不一定只表示can的过去式，它还可以单独成词，用于表达语气的委婉。例如
1.Could you help me？能帮帮我吗？（表示很客气很委婉）
2.Can you help me？能帮帮我吗？（就只是一般的请求）
因为你是在求别人帮你，所以通常情况下我们应该用委婉的语气，即用Could.
但是如果是Can I help you?有什么需要效劳的吗？这里是我主动请求去帮助他人，自然不用委婉，直接用Can就行了，通常就不会说Could I help you?
sorry I could do nothing for you.
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