Noah Webster supported himself through sales of his spelling book over 100 million copies of the book were sold.

This has to be a dangler right? Please tell me I'm right.

6 answers

It doesn't fit my definition of a dangler. What do you mean by "dangler?"
subject not telling action.
I'd call it a runon or fused sentence.

http://www.chompchomp.com/terms/fusedsentence.htm
Learning to sail is challenging and exhilarating it is also not the easiest thing to do.

I think this one may need a comma. yes?

But it seems to lack parallel construction.

/
Did you read and study the link Ms. Sue gave you? Even if you did, read it again ... and then rethink your last answer.
B)runon