how did you know
Comment as-tu su que Tom allait nous aider ?
How did you know that Tom was going to help us?
Comment as-tu su où me trouver ?
How did you know where to find me?
Comment as-tu su que c'était moi ?
How did you know it was me?
How did you know where I was?
Comment as-tu su qu'elle était malade ?
How did you know she was sick?