البناء و الإعراب

I was reading a good Arabic grammar and just wanted to share:

There is no real rule for which a word is مبني on a dammah, fatha, kasrah or sakun. The only way to know this is by hearing proper speech.

This does not pose a great problem as the majority of words in Arabic are معرب and not مبني.



The general rule is that verbs are مبني and that nouns are معرب. Some nouns are مبني because they resemble prepositions which are مبني. Similarly present and future tense verbs are معرب because they appear like nouns in the number of letters and vowel markings and the lack of vowels. E.g. ناصر and ينصر .