I would look into an iron on patch if it is too torn to sew up.
Emily is it on a seam? Hand sewing in tiny stitches will help.
You could sew them or get similar fabric and sew it on
The cushions will have to be removed entirely in order to repair them properly and so that the 'fix' has any longevity.
If you sent in a picture of the tears, we could then see how extensive the damage is, the style, and fabric of your sofa. Once we see what you have to work with, we could perhaps offer some other suggestions.