How sentences are formed in Arabic?

In Arabic, sentences are divided into two types:

1. Nominal Sentence which starts with a noun. e.g. Peter is calm: بيتر هادئ

2. Verbal Sentence which starts with a verb. e.g. Peter came: جاء بيتر

Where: 

Peter: بيتر

Calm: هادئ

Came: جاء