Assertion: verb's base form | /r/CapableOf | end in one of the sibilant sounds
Facets:
Source sentences:
text: However if the base form ends in one of the sibilant sounds (/s/, /z/, /ʃ/, /ʒ/, /tʃ/, /dʒ/) and its spelling does not end in a silent e, then -es is added: buzz → buzzes; catch → catches.