In Episode 69, Tim explains wh- questions using two complementary methods.
The first method is the old-fashioned one, using the rules of grammar. A wh- question is one that starts with a question word such as who, what, where or why. Wh- questions all use the same construction QU + A + S- question word, then auxiliary verb, then subject. 
The other method is what Tim calls brute force empiricism, in other words, learning from lots of examples. In Episode 69, Tim reads over 200 examples of wh-questions, starting with shorter questions and moving on to longer ones so you are never challenged.

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