Al-Jazeera offers a grammar test. There are a couple of pitfalls. So, reason enough to take a look at the most important Arabic grammar topics.
The Arabic expression فأسقيناكموه means "and we gave it to you to drink". This intriguing phrase is from the Quran. Let's analyze it.
The و does not always mean "and". The waw of accompaniment (واو الحال). Such constructions are tricky as we need different words in English.
Reading grammar books in Arabic can be challenging if you cannot decode the language of the grammarians (i'rab إعراب). But there is a formula.