were grinning
-estuviste sonriendo
Past progressiveconjugation ofgrin.There are other translations for this conjugation.

grin

At the same time, and out of the corner of his eye, he appreciated the way Teresa and Jennifer were grinning at his histrionic expression.
Al mismo tiempo, y por el rabillo del ojo, apreció el modo en que Teresa y Jennifer sonreían con su expresión histriónica.
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