Question

The difference between “lie” and “lay” is that “lay” must be followed with a(n) _________.

Answer 1

The difference between "lie" and "lay", is that lay is to place something in a position of use, and lie is to, be still or to be kept in a specified place. 

Example for lay: "it is recommended to have your tile laid by professionals" 
Example for lie: "The dress lay still on the bed "