Re: English learning thread
I find it hard to talk about the use of "has had" alone isolating "have had", both are used in expressing the Present Perfect Tense. "Have had" is used in all persons except in third person singular like in the example you provided I have had lunch while "has had" is used in third person singular example He has had lunch.
By Mama wawilii
On the other hand the tense form in "had had" is past perfect. It is used to express an activity that happened before another activity in the past, example I had had lunch at 1 before going to work . "Had had" is also used to indicate possession.
Other contributors may offer us more insight in the topic.
“We are what we repeatedly do. Excellence, then, is not an act, but a habit.” Aristotle.