Indicative + que + subjunctive help

[PieMage]

I'm doing an online assignment, and the program is not very helpful at pointing out what I'm doing wrong. Here are the instructions:

React to the following circumstances by completing the sentences according to the cues. Make any necessary changes. Remember that an infinitive phrase is generally used when there is no change of subject.

I'll give the prompts and responses that I got wrong, any help would be greatly appreciated. I think the main thing I'm confused about is when to use que in the sentence and when not to.

2) Es absurdo: las entradas (tickets) / espectáculo / costar / tanto dinero

Es absurdo que las entradas para el espectáculo cuete tanto dinero.

3) Es increíble: (tú) no / conocer / novelas / Gabriel García Márquez

Es increíble que no conozca las novelas de Gabriel García Márquez.

4) Sentimos: (nosotros) no / poder / ayudarlos a Uds.

Sentimos no poder ayduarlos a Uds.

5) Me molesta: haber / tanto / personas / que / hablar / durante / función

Me molesta que hay tantas personas que hable durante el función.