1
subject + verb + all along
I knew that all along.
我自始至终都知道。
一直；始终
先理解核心含义，再看它在真实句子里的用法。
一直；始终
For the entire time; always.
I knew that all along.
我自始至终都知道。
自始至终；一直。
For the entire time; always.
She knew the truth all along but chose not to reveal it.
她始终知道真相，但选择不透露。
I suspected all along that he was lying, and now I have proof.
我一直怀疑他在撒谎，现在我有证据了。
They had been planning the surprise party all along without telling me.
他们一直在计划那个惊喜派对，没有告诉我。
I knew that all along.
我自始至终都知道。
He has been lying to us all along.
他一直都在对我们撒谎。
All along, she had planned to leave.
从一开始，她就计划离开。
Not this
She all along arrives on time.
Use this
She always arrives on time.
“all along” 强调从过去某一时间到现在一直如此，不用于描述一般习惯；表示习惯性动作应用 “always”。
Not this
I will all along support you.
Use this
I will always support you.
“all along” 用于描述过去延续至现在的情况，不能与将来时连用；表示将来始终如此应用 “always”。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use all along naturally, then get feedback on meaning, tone, grammar, and phrasing.
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常与完成时连用，表示从一开始到现在一直如此。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.