Form Objects:

Dropdown Menu:

Use for multiple options with one selection.
Radio Buttons:

Use for multiple options with one selection.
Check Boxes:

Use for multiple options with multiple selections.
Comments:

Use for multi-line text box input.

Email Field with Confirm:  

Use this object to verify email format and require a confirmation entry that is required to match. 
Text Fields:

Use this object for gathering Names, addresses, etc.

Divider Button:

Use this object to seperate your form in logical steps.

Submit Button:

Use this object at the end of your form to submit form contents and trigger a confirmation Alert.