import re


def reg_plural(s: str, n: int) -> str:
    """Form regular English plural form, e.g. 'position' -> 'positions' 'bush' -> 'bushes'"""
    if n == 1:
        return s
    elif re.match('(?:[sx]|[sc]h)$', s):
        return s + 'es'
    else:
        return s + 's'