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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
Referencing of example sentences. Where example sentences have been taken from the sources listed above, the sources are provided in parentheses at the end of the example.his MÄori dictionary is now available as an app. With the iPhone, iPod Touch, iPad, and Adroid app you can use the dictionary anywhere without the need to be online. iPhone app | iPad app | Android app.