It's easy to be at a loss for words when it comes to expressing your condolences.  Following are some commonly used phrases that you may want to consider...

- Our thoughts and prayers are with you

- Our thoughts and prayers are with you during this difficult time

- Our deepest sympathies during your time of loss

- [Name] will always be in our hearts and memories

- With deepest sympathy

- May the peace which comes from the memories shared, comfort you now and in the days ahead

- We wish to express our sympathy for your loss and to let you know that our thoughts are with you

- May you take comfort in knowing I/we care