This unit is focused mostly on grammar, namely, the type 3 verb suffixes -choH and -qa'.

-choH indicates a change in state; typical translations are begin to, start to or become, but sometimes also fall (e.g. QongchoH start to sleep = fall asleep).

-qa' indicates that an action had taken place, stopped, then resumed again. Again is often a translation for -qa'; sometimes, back, re-, resume, or repeat.

Note that since both of those suffixes are type 3, they fit into the same "slot" after a verb and cannot both attach to the same verb at the same time—you can use either -qa' or -choH but not both at once.

So there's no -qa'choH or -choHqa' for start to … again; just use -qa' in this case.