Read the given sentences and choose the verbs that agree with the nouns.
I ______ go for walk every day when I was working in Philadelphia.

The correct answer is: Would

We use would mainly to: talk about the past, talk about the future in the past, express the conditional mood. We also use would for other functions, such as: expressing desire, polite requests and questions, opinion or hope, wish and regret. 'I would go for walk every day when I was work in Philadelphia' here 'would' used express past habit.