थी कि

was that

→ होना
phrase Uncommon #3,148
was that थी is the feminine singular past form of “be”; कि introduces a following clause. In patterns like इतनी हैरान थी कि, the meaning is “was so surprised that.”
HI: मुझे खुशी थी कि तुम आए।
EN: I was happy that you came.

हमने कसम खाई थी कि हम एक नज़र देखेंगे भी नहीं।

We had sworn that we wouldn’t even look at each other.

— 3 ईडियट (2009)

माँ गोदावरी की कसम खाई थी कि हथियार मिलने के बाद ही वापस आऊँगा।

I had sworn by Mother Godavari that I wouldn’t return until I found the weapons.

— రౌద్రం రణం రుధిరం (2022)

मुझे चिंता थी कि मैं तुम्हें ढूँढ नहीं पाऊँगा।

I was worried I wouldn’t be able to find you.

— 風立ちぬ (2013)

मैं कुछ उत्सुक थी कि यह सब होगा कैसे।

I was curious about how all this would happen.