ใครเก่งแกรมม่า ช่วยดูให้หน่อยครับ

กำลังเริ่มแต่งนิยาย จะไปรอดป่าวครับ
When I went to town yesterday with the leathers I found it hard walking in the soft mud. It took me a long time to get to town, and other men with leathers had come in earlier to do their trading. The storekeeper was busy, and I had to wait until he could look at my leathers. Then we had to bargain about the price of each one, and then I had to pick out the things I wanted to take in trade. So it was nearly sundown before I could start home.

ผมใช้เครื่องหมายวรรคตอนถูกไหมครับ