However, this code will have an error if the user enters a negative number (try it!). Before you set the beak and pause, you want to check if time is less than zero. The code below shows how to do this with an if-else statement. The keyword if is followed by a comparison, time < 0. This comparison is a Boolean expression, which means that it is either true or false. If the comparison is true, the program runs all indented lines inside the if part of the if-else statement. If the comparison is false, the program runs all indented lines inside the else part of the if-else statement. Then the program moves on to the next unindented line. In this case, if time is less than zero, the program prints an error message. Otherwise, it turns the Finch for time seconds.