They can also help stop you touching your nose and mouth, which prevents viruses moving on to your hands and then being spread on to surfaces.
If you want to spend time in a room with someone you live with, or a visitor, covering your face will help to reduce the spread of the virus if you cannot be 2 metres/6 feet apart. And open a window too!
This means that you can still spend time with other people in your home. Limiting how long you are in a room with others also helps - the longer you spend together the more viruses could enter your body.