Use these three steps with the simple noun-predicate examples in this level.
1. Find إِنَّ، أَنَّ، كَأَنَّ، لَكِنَّ، لَيْتَ or لَعَلَّ.
2. Identify its ism: this noun is mansub.
3. Identify what is stated about that ism: in these examples, it is a marfu noun serving as khabar.
Then check the visible sign. It may be fathah, or another sign such as ya in الْكَافِرِينَ. This level has taught only the first reason for nasb.