quoi dire
I was at a loss as to what to say.
Je ne savais plus quoi dire.
She didn't know what to say to him.
Elle ne savait pas quoi lui dire.
Elle ne sait pas quoi dire.
I don't really know what to say.
Je ne sais pas vraiment quoi dire.
Je ne savais pas quoi dire.
I didn't know what to say to him.
Je ne savais pas quoi lui dire.