Usages of حتى
سكري الشباك حتى ما يدخل الغبار عالبيت.
Close the window so that dust does not get into the house.
حط رصيد زيادة بالتلفون حتى تقدر تتصل اذا صار شي.
Put extra credit on the phone so that you can call if something happens.
Elon.io is an online learning platform
We have an entire course teaching Arabic grammar and vocabulary.