You can easily emphasize a اِسْم by just adding the corresponding personal pronoun in its normal form after the اِسْم which you want to focus on.
This form is called ضَمِير الْفَصْل – as it separates the subject from the predicate and provides some space in between.
Let us look at some examples.
|It is Khalid who sits there.|
خالِد هُوَ الْجالِسُ هُناكَ
|The engineers were the ones responsible for the success of the project.|
كانَ الْمُهَنْدِسُونَ هُم الْمَسْؤُولِينَ عَنْ نَجاحِ الْمَشْرُوعِ
|I have done my duty.|
قُمْتُ أَنا بالْواجِبِ
|He wrote the lesson himself.|
كَتَبَ هُوَ الدَّرْسَ