Dangling participles
Participles of verbs are often used to introduce subordinate clauses, which give extra information about the main part of a sentence (known as the main clause). It’s important to use participles in subordinate clauses correctly. The participle should always describe an action performed by the subject of the main part of the sentence. For example:
Mrs Stevens, opening the door quietly, came into the room.
[subject] [participle]