That only happens sometimes

In his defense, the first ones he did that to were plant people so the CO2 from his lungs would be useful to them

Or maybe they killed their reflection

Like I said before to someone else, that is not actually grammatically correct

aliens of stone crash-landed under mount Vesuvius and were going to use the heat from the Earth's core to turn all humans into creatures of stone like them, but instead the Doctor and Donna go under the mountain and blow it up while safely in an escape pod, but that causes lava to burst from beneath the earth through the mountain and kill everyone in pompeii, except for a single family because Donna convinces the Doctor to bring them to the hills in the TARDIS instead of the beach, where everyone else went

Implied subjects are not grammatically correct

I think that's necessary for most dresses

but he should be able to figure out the next letter without reciting the entire alphabet

rut rog? rere?