If the patient’s chest is not inflating during the breathing task you should check the patient’s:

1. Airway: Check if the patient's airway is clear. Obstructions such as food, vomit, or the tongue can block the airway and prevent chest inflation.

2. Breathing: Observe the patient's breathing pattern. Are they breathing too shallowly or not at all? This could be why their chest isn't inflating.

3. Equipment: If the patient is on a ventilator or receiving supplemental oxygen, check to make sure the equipment is functioning properly.

4. Lung condition: The patient may have a medical condition that is preventing their chest from inflating, such as a collapsed lung or severe pneumonia.

5. Position: Ensure the patient is in the correct position. If they're lying on their back, for example, it might be harder for them to breathe.

If you're unable to determine the cause or correct the issue, seek immediate medical assistance.