didn't know how to
Lui non sapeva come esprimersi.
He didn’t know how to express himself.
He didn't know how to help her.
He didn't know how to help him.
He/She didn't know how to express himself/herself.
Non sapeva come poteva aiutare.
They didn't know how they could help.
He didn't know how to thank her.
She didn’t know how to thank him.
Tom non sapeva come chiedere la domanda giusta.
Tom didn't know how to ask the right question.
Tom non sapeva come farlo.
Tom didn't know how to do it.