What did Jessica say? - She is thinking about joining us for dinner, but she's not sure.¿Qué dijo Jessica? - Está pensando venir a cenar con nosotros pero no está segura.
Why is she so upset? - She is thinking about her grades again and worrying.¿Por qué está tan triste? - Está reflexionando sobre sus notas y está preocupada.
She is thinking about all the tricks she's going to play on Marcus to get back at him.Se está imaginando todas las bromas que le va a hacer a Marcus para vengarse de él.