- 1.
can 的过去式 -
• I couldn't get the ticket today. 今天我没能买到票。 -
• My son could read and write when he was five. 我的儿子在5 岁时就能读能写了。 - 2.
[用于表示可能性而不是肯定性] -
• In his view, the accident could have been prevented. 依他看来，这次事故本来是可以避免的。 - 3.
[用于间接引语代替直接引语中的can] -
• She said they could smoke in this room. 她说他们可以在这个房间里抽烟。 - 4.
[用于婉转的请求] -
• Could we ask you what your opinion is? 我们可以听一下你的高见吗？ - 5.
[表示不满和烦恼] -
• He could at least have met me at the station. 他本来至少可以到车站去接我。