Unreal Conditionals with لو
While you use إن for conditions that might actually happen, Arabic uses لو for hypothetical, contrary-to-fact, or "unreal" conditions. These are usually situations in the past that did not happen.
To form an unreal conditional sentence, start the condition clause (the "if" part) with لو followed by a past tense verb. The result clause (the "then" part) also uses a past tense verb.
When the result clause is affirmative, you attach the response particle لـ to the beginning of the result verb. This serves as a formal "then" to introduce the outcome.
| If the scientist had discovered the disease, she would have invented the vaccine. | لو اكتشفت العالمة المرض، لاخترعت اللقاح.law iktashafat al-'âlimah al-marad, lakhtara'at al-liqâh. |
| If the epidemic had arrived, many people would have died. | لو وصل الوباء، لمات كثير من الناس.law wasala al-wabâ'u, lamâta kathîrun mina an-nâsi |
Changing Scientific History
This structure is perfect for imagining alternate histories or what would have happened if key scientific discoveries had gone differently.
Notice how the prefix لـ attaches directly to the past tense verbs in the result clauses to show the hypothetical outcome.
| If the researcher had used the microscope, she would have seen the cell. | لو استخدمت الباحثة المجهر، لرأت الخلية.law istakhdamati l-bâhithatu l-mijhara, lara'ati l-khaliyyata |
| If the patient had taken the vaccine, he would have survived the epidemic. | لو أخذ المريض اللقاح، لنجا من الوباء.law akhadha al-marîdu al-liqâha, lanajâ mina al-wabâ'i |
Even when using the verb "to be" to describe a state of being rather than a distinct action, the rules remain exactly the same:
| If the wheel had been a new invention, technology would have been slow. | لو كانت العجلة اختراعا جديدا، لكانت التكنولوجيا بطيئة.law kânati al-ajalatu ikhtiraan jadîdan, lakânati at-tiknûlûjiyâ baṭî'atan |