[Grammar] about followed by that clauses

[kittennoh]

Hello?

I have been learning English for a couple of years and I have a question to ask.
I learned that prepositions should be followed by noun phrases, gerunds, clauses with "whether" or interogatives.
But is it okay if I put "that clauses" after prepositions?

For example,
1) I'm worried about the replacement of A by B.
2) I'm worried about whether B replaces A.
3) I'm worried about A being replaced by B.
4) I'm worried about what might replace A.
5) I'm worried about that B would replace A.

In the term of grammar, I think 5) doesn't seem okay, but I have found so many examples using this pattern through "Google."

I'm really curious but in trouble. Thanks in advance.

 

[5jj]

Welcome to the forum, kittenoh. :hi:

The first four sentences are fine; the fifth is not. You could say, "I'm worried that B will/would/might/etc replace A"

There's a lot of strange English on the internet.

 

[kittennoh]

Thanks a lot. Your comment helped me.
There are too many examples using the no. 5 pattern on the Internet, though.

 

[Barb_D]

Could you post a couple? It's possible that the "that" you see doesn't mean what you think it does.

A golfer, talking about a course we are both familiar with: I'm worried about that dogleg on the 14th hole. I ended up four over par on that hole last time.

A woman talking to her friend about street they both know: I'm worried about that left turn across three lanes of traffic. We may sit there for ten minutes. Maybe we should take another route.