ستشعر بتحسن إذا شربت هذا الدواء. can i say this instead ? ستشعر بتحسن إدا تشرب هدا الدواء noticed the word تشرب .. إذا here means (if) .. and (if) in english has 4 rules/conditions which are: -------- 1st conditional/real conditional: If + present, future (will/going to) EX: If it rains tomorrow, I'll stay at home. 2nd conditional/unreal conditional If + past (with "to be" were/was are both typical), would/could + verb EX: If you didn't lie, we would be fine now 3rd conditional/past conditional If + past perfect, would have + verb. EX: If I had known that you were coming, I'd have baked a cake. 4th conditional If + simple present, simple present. EX: If you heat water it boils. ---------- in Arabic إذا has its own rules/conditions and one of them is إذا + فعل ماضِ + فعل مضارع بدلالة المستقبل ستشعر بتحسن إذا شربت هذا الدواء. ستشعر = you will feel .. س here indicates the future tense < ( feel ) is in the present and ( will ) indicates future (فعل مضارع مع أداة تدل على المستقبل) شربت = drank/took (past tense) < فعل ماضِ .. another example: إذا درست جيداً سوف تنجح = you will pass if you study well / if you study well, you will pass .. check this, the conditions of (if) in English http://answers.yahoo.com/question/index?qid=20090529024332AA9s2zg the conditions of (إذا) in Arabic http://sedratatomorow.ba7r.org/t16-topic

No , even in english or any language .. you will get better after you drink the medicament .. تشرب is in the present , شربت is in the past

you can say it but it's wrong u noticed the word تشرب we say : ستشعر بِتحسن إذا شربت هذا الدواء