You can take those examples which I find very hard and show me on them which is a complement and which a modifier?
- The idea that he proposed //The idea that it will rain I don't know, seems similar (maybe both modifiers?).
- The man to contact for the job.// Her insistence to see the manuscript. I have no idea here (I would say both are complements).
- A belief in Politics. //A ring of gold. Here are again both examples complements (I would say).
- A ban on military training. // The book on the table. Again both modifiers (but I am just guessing).
I understand that complements are obligatory because they are licensed by the noun but I don´t know what does it mean and how can I make a test to be able to recognize them. I tried so many times but I don't see any logic in it so I often confuse their use (using a modifier instead of a complement) .