The situation is bad, but it could be worse. (now)
請問上面這句中的could的用法是
算2a 還是 3a ??
could 的用法:
1.can 過去式
He said he could do it.
2.表現在或未來的可能，意思同can的語氣較can來的較委婉，較不確定
a. 現在有可能 (possible now)
The story could (有可能) be true, but I don't think it is. (不能用 can be true)
b. 未來有可能 (possible in the future)
I don't know what time Liz is coming. She could (有可能) get here at any time.)
3.表假說法中的與現在事實相反(could + V)或與過去事實相反(could have + Vpp)
a. 現在事實相反(could + V)
I'm so tired. I could sleep for a week. (now)
b. 與過去事實相反(could have + Vpp)
I was so tired. I could have slept for a week, (past)
The situation was bad, but it could have been worse. (past)