2 The teacher said (that) a computer runs on electricity. (The tense does not change because the sentence expresses a general truth.)
3 Shane told me (that) he had lost his camera.
4 He says (that) technology is advancing fast. (The tense does not change because the reporting verb is in the present.)
5 The scientist said (that), while he was conducting an experiment, the lab caught fire. (The tense does not change because there is a past continuous in a clause of time.)
6 Joe told us (that) they were leaving immediately.