依句文法有無錯？

A Prayer for Owen Meany: A Novel‎ - 第 510 頁John Irving 著 - 1989 - 543 頁

THE POINT IS, I'LL HAVE LOTS OF FREE TIME AND WE CAN JUST HANG OUT TOGETHER.
LIKE I TOLD YOU, THE MOTEL HAS A GREAT SWIMMING POOL; AND IF IT'S NOT TOO HOT,
...
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The Seasons of a Heart‎ - 第 22 頁Constance O. Irvin 著 - 2005 - 152 頁

"We can't just leave. What about Diana?" "Her? Oh, sure. We'll just tell her
that we decided to walk out." He finished his cigarette and threw the remains
...
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Alice's Adventures in Wonderland and Through the Looking-Glass: And What ...‎ - 第 127 頁Lewis Carroll, Hugh Haughton, John Tenniel, Sir 著 - 2003 - 400 頁

Perhaps Looking-glass milk isn't good to drink — but oh, Kitty! now we come to
the passage. You can just see a little peep of the passage in Looking-glass ...
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A friend can only be a friend. ( correct)

A friend can just be a friend. ( correct)

In English grammar, there is no rule that says we cannot use " just= adverb" after the modal verb" can".

We are just friends. ( present tense)
We were just friends. ( past tense)
We will just talk to her. ( future tense)

I am just playing around. ( present continuous tense)

I was just kidding. ( past continuous/progressive tense)
We have just finished eating. ( present perfect tense)
It is correct to say " We just cannot stop it. " as well

To 003, I am sorry that I cannot agree with you.

I am here to show people what I know and learn what I don't know.

Bye for now.

2009-01-23 13:04:01 補充：
You are 002. ^_^ Sorry!

全句應該寫成：

"a friend can just be a friend"

"just" 要放响 "can" 後面先啱。