Problem statement:

> I just can say Great! 

or: 

> I can just say Great!

The problem statement is one of many such statements that usually come up in the minds of non-native speakers. Others are like:

> It's 6 only.

Or:

> It's only 6.

One more:

> I wonder sometimes do native speakers even care for such detail.

Or: 

> Sometimes I wonder do native speakers even care for such detail.

There may be a possibility that to me it may seem all these examples having a common issue but to an expert there may be more than one problem. Would really appreciate a detailed answer. I can add on more examples, if required.