function processFutureTime(string) {
        var number = string.substr(0, string.indexOf(' '));
        if (eifelerRegelAppliesToNumber(number)) {
            return "a " + string;
        }
        return "an " + string;
    }
Returns true if the word before the given number loses the "-n" ending.
e.g. "an 10 Deeg" but "a 5 Deeg"

@param number {integer}
@returns {boolean}