could和should的區別
來源：趣味百科館 3.07W
could和should的區別：
1. should可以用於第一人稱或第三人稱的疑問句中，表示徵求意見。
例如： My brother likes to listen to CDs. He often plays his CDs too loud. What should I do?
2. should 表示義務，可以用於提供建議，表示“應該”, 後面跟動詞原形。
例如： Maria argued with her mother last night. She is very upset now. What should she do? I think she should say sorry to her mother.
3. should也用於表示某事發生的可能性，用於表示推測的詞，意爲“可能”。
例如： They should arrive soon.
4. could不僅僅是充當can的過去式，而且是一個單獨的情態動詞，表示“能；可以”，用來提供建議，後面跟動詞原形，它和should在意義上不同，前者是“可以”，後者是“應該”，表示不同的態度，但兩個都可以用來提供建議。
例如： You could borrow a bike to that park. I think you should have a talk with your friend.
