Using or omitting that can be confusing. Sometimes a sentence needs a that, sometimes a sentence doesn't need a that, and sometimes using that is optional. This article addresses some tips to help one understand when that is necessary, when it is optional, and when one might want to use that even if it is optional.
CU Commons Citation
Tenielle Fordyce-Ruff, To That or Not to That: When to Use and When to Omit That, 61 Advocate 44, 45 (2018).