Use if with the past simple and would with a base verb for an imagined or unlikely present or future situation. The past form does not necessarily refer to past time.
Practical examples
If I had more time, I would learn another language.
لو كان لدي وقت أكثر، لتعلمت لغة أخرى.
What would you do if you lost your phone?
ماذا ستفعل لو فقدت هاتفك؟
If we lived closer, we would meet more often.
لو كنا نسكن أقرب، لالتقينا أكثر.