Learner detects a participle whose subject is missing or wrong, and repairs it by changing the main clause rather than the opener.
Preview · progress not saved — Chapter 1 is free
Six sentences. Pick what it says, not what it meant.
Having finished the report, it was sent to the committee. What does this sentence say?
Where it borrows from, where the repair goes, and the passive trap.
Having finished the report, it was sent.
The sentence says the report finished itself.
Nothing here is ungrammatical. No spellcheck flags it, and the writer never sees it — only the reader does.
A hat lifted by the wind, and a hat lifting itself.

Both pictures are perfectly clear. Only one of them is possible.
Twelve openers. Four are sound, and two of those look wrong.
Sort each item into the correct category
Eight danglers. The opener is locked — only the rest may change.
Having finished the report, (was: it was sent to the committee)
Walking through the city, (was: the noise was overwhelming)
Being new to the country, (was: everything seemed strange)
After studying the data, (was: the conclusion was clear)
To improve results, (was: more funding is needed)
Living in dry areas, (was: water is scarce)
Faced with rising costs, (was: the council cut services)
Generally speaking, (was: the results are encouraging)
Two participle openers, and name who performs each.
Topic: a city deciding whether to ban cars from its centre.
Write two sentences, each opening with a participle clause.
Then, in the second box, name who or what performs each opener.
One per line.
Two short answers.
Read it as a stranger would. Who is doing the opener?