There are a number of ways that you can help someone who is grieving deeply. The most important thing is to be there for them and to offer support. You can do this by listening to them, allowing them to express their feelings, and providing practical assistance if needed. You can also help them to stay connected to their loved ones and to the outside world, and to find healthy ways to cope with their grief. If the person seems to be struggling significantly, it may be necessary to seek professional help.