Including "That" in Relative Clauses

English allows the omission of the relative pronoun that in many cases. In most European languages, inclusion of the relative pronoun is mandatory. Even for English speakers, the use of that helps comprehension. Consider this sentence:

Verify the draft is at the appropriate status.

Initially, a reader might understand the meaning to be Verify the accuracy of the draft. Including that prevents an initial misreading and speeds comprehension:

Verify that the draft is at the appropriate status.

A good practice is to include that even when you do not anticipate that a sentence will be misunderstood. For example:

Changes that you have made will affect the total quantity requested for this rate.