1
for a long time
用于表示持续的时间状语。
I waited for a long time.
我等了很久。
久长
先理解核心含义，再看它在真实句子里的用法。
久长
a long period of time
I waited for a long time.
我等了很久。
I haven't seen you for a long time.
我很久没见到你了。
It took a long time to finish the project.
完成这个项目花了很长时间。
We waited a long time for the bus.
我们等公交车等了很久。
用于表示持续的时间状语。
I waited for a long time.
我等了很久。
表示某事耗时长久。
The project took a long time.
这个项目花了很长时间。
表示遥远的过去。
That happened a long time ago.
那发生在很久以前。
Not this
I slept long time.
Use this
I slept a long time.
中文学习者常遗漏冠词'a'，a long time中的'a'不可省略，表示'一段长时间'。
Not this
It was a long time since I saw him.
Use this
It has been a long time since I saw him.
在'since'引导的时间从句中，主句通常用现在完成时，表示从过去某时持续到现在的状态。'It was a long time'为一般过去时，不符合语法。
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Dictionary facts from BridgeDict normalized sources.