"ये लड़कियाँ यहाँ थीं।"

Translation: These girls were here.

[GoWiP]

these girls used to be here. is wrong why? thanks!

[Gita-ji]

When the verb to be, i.e. थीं, is the only verb in the sentence, used to is not used.
For used to be here use वहाँ होती थीं — vahān hotī thīn.

[raypab]

that's sufficient. indefinite past tense.

[Balasankar7]

Hi duo whow this became s past tenes?

[RADHIKA108]

When do we use the थीं and the थी ? Please reply as I need to know. Is Vinnay still monitoring this site?

[Gita-ji]

Use थीं for feminine plural (or honorific). Use थी for feminine singular.

[ManojKumar686005]

These girls were here