When I first opened an account with GMail, the first thing that I’ve noticed is that the Trash Folder is not being shown in the left hand corner unlike Yahoo, AOL, Hotmail etc. Actually that folder is just hiding and you need to set it manually. To do it:
1. Click the circle icon in the upper right-hand corner of your GMail account.
2. Click Mail Settings.
3. Click Labels.
4. Find the word Trash and click Show.
5. The Trash folder must be showing in the left hand corner now.