We started the exam after the teacher told us to begin. Everyone passed the exam but me. I sat there looking at the exam but not reading it. In the first and second sentences, the word after functions as a preposition. Similarly, the word but functions as a preposition in the fourth and fifth sentences and as a conjunction in the sixth sentence.
Answers separated by a comma, indicate the answers for more than one blank in the item.
A preposition is used to connect nouns and noun structures to other structures in the sentence. A noun structure following the preposition is called the object of the preposition. We thought about giving a present to whoever worked for us. The preposition is usually placed before the object. We forget which countries we went to .