Question

She has not seen Daniel for two days.改为同义句

Answer 1

现在完成时可以表示一个持续的动作或状态，这种表示持续的动作、状态的动词往往是无限动词和静态动词，如live、study、teach、be、wait等。现在完成时表示持续的动作或状态的时候，常常要和since或for引导的字或从句连用，since在这里是“自从”的意思，可以是作介系词，也可以是作连接词，表示的是过去时间中的某个时间点，而for表示“经历”，是一个介系词，表示一个时间段，如：
I have lived here for more than thirty years. = I have lived here since more than thirty years ago.
I have been here since last October.
She has taught us since I came to this school.
有限动词一般不用现在完成时表示持续，除了一些个别的动词例外：
The two leaders have met for two hours.
He has visited the USA for three days.
Since when have you become active?
有限动词在否定结构中，则可以用现在完成时表示持续，因为“否定”本身是可以延续的，如：
I haven't bought anything for three months. = I haven't bought anything since three months ago.
I haven't touched beer for a whole week. = I haven't touched beer since a whole week ago.
你给出的这句句子，改成同义句，改成：She hasn't seen Daniel since two days ago. 注意，see在这里是有限动词，一般不用现在完成时表示持续，但是在否定结构中可以。希望我能帮助你解疑释惑。

追问

''She hasn't seen Daniel since two days ago. 注意，see在这里是有限动词，一般不用现在完成时表示持续，但是在否定结构中可以。''最关键，，，，谢谢你了

追答

能够帮助到你是我的荣幸。