例句:
He could be sick.表示现在或将来的现实的可能
He could have been sick.表示过去的具体可能
this is a wonderful place,i could stay here forever.(不现实)
can表示某事很可能会发生,could表示某事发生的可能性较小或某事是否会发生存在质疑。
例句:
He could be sick.表示现在或将来的现实的可能
He could have been sick.表示过去的具体可能
this is a wonderful place,i could stay here forever.(不现实)
can表示某事很可能会发生,could表示某事发生的可能性较小或某事是否会发生存在质疑。