Una voz femenina clara y articulada, ideal para explicaciones detalladas y contenido educativo en ingles Rule 4: Do not double W, X or Y. Play… playing. Snow… snowing. Fix… fixing. We only add ING. Rule 5: If the verb ends in IE, change IE to Y and add ING. Positive sentences: They are playing basketball. It is snowing outside. The baby is crying. Negative sentences: They are not playing basketball. It is not snowing outside. The baby is not crying.