Question

Thick smoke greeted her when she opened the door . ( Use 'opening' instead of opened )
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Answer 1

Answer:

Thick smoke greeted her when she was opening the door

Answer 2

opening the door, a thick smoke greeted her.

• the given sentence is a complex sentence.
• the sentence above is started with the word opening as instructed
• this makes the above sentence a simple sentence.
• a simple sentence has only one subject- predicate.
• it has one clause which is independent .