If the sentence start with ~ing form, how can I understand? There is a sentence I'm not able to understand and how to translate. Please help me and tell me more grammatical factors on it. Perceiving that he wasn't happy with arrangements, I tried to book a different hotel. The way that I understood this sentence is I noticed he was not happy with arrangements I made, so I tried to find another hotel to make a reservation. Is that correct? and tell me more about the usage of ~ing form in the begining in the sentence.