je ne savais pas comment
I didn't know how to react to that.
Je ne savais pas comment réagir à ça.
I didn't know how you were feeling, all that you'd suffered.
Je ne savais pas comment tu te sentais, ni tout ce que tu avais enduré.
— Pain and Glory (2019)
I didn't know how to tell him how much I loved him.
Je ne savais pas comment lui dire à quel point je l’aimais.
After a while, I wanted to come home, but I didn't know how.
Au bout d’un moment, j’ai voulu rentrer chez moi, mais je ne savais pas comment faire.
— Field of Dreams (1989)
I didn't know how to make new books either.
Je ne savais pas non plus comment créer de nouveaux livres.
I didn't know how you'd take it.
Je ne savais pas comment tu le prendrais.
— Eat Drink Man Woman (1994)
I didn't know how I should answer his question.
Je ne savais pas comment répondre à sa question.