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has seen - is present perfect (third person) - he/she/ the doctor has seen
had seen - is past perfect (all persons) - he/ she / the doctor / we / they had seen.
has seen - present perfect is used to talk about something that happened in the past and is related some way to now.
eg He has seen the movie before.
had seen - past perfect is used to talk about something that happened in the past before another thing (usually past simple) that happened in the past.
eg He had seen the movie when he went to Hamilton.
What else can I help you with?
What is the difference between abstract and concrete?
I think you are asking the difference between abstract nouns and concrete nouns. A concrete noun is something that can be seen or touched like a cat or a tree. An abstract noun is something more intangible like happiness or peace.
What is a sentence with difference?
She enjoys doing 'spot the difference' puzzles.There is a difference between happy and sad.What is the difference between these two cakes?
What are the difference between ERD and UML?
what is the difference between ERD and UML Flowcharts.
What is the difference between the commutative and symmetric properties?
what is the difference between commutative and symmetric properties
Difference between cross section and block diagram?
difference between cross section and block daigram
What is the difference between see and seen?
Past and Present tenses. I can SEE I have SEEN.
What is the difference between the sky as seen from latitude 30 degree north?
... and the sky as seen from where else . . .
What is the difference between a Trailblazer LT and a Trailblazer LTZ?
the only difference ive seen is the blinkers on the side mirrors
What is difference between constraint an risk?
A constraint is a limitation that is visible and present. The difference between a constraint and risk is that a risk is problem that is not yet seen, or a potential problem.
What is difference in photo paper plus glossy and photo paper glossy?
There is no difference between photo paper glossy and plus glossy. The main difference in photo paper can be seen between a matte finish and glossy finish.
What is different between a 9500 and a 9350 blackberry storm?
According to gsmarena.com comparison, I have not seen any difference.
Is there a difference between lying and keeping secrets?
Yes and no. Sometimes keeping secrets can be seen as a lie of omission.
What is the difference between published and unpublished data?
One can be seen on a page while the other one cannot.
What is one difference between visible and non-visible light?
One difference between visible and non-visible light is that visible light can be seen by the human eye, while non-visible light, such as ultraviolet or infrared light, cannot be seen without special equipment.
What is the difference between microorganism and protists?
microorganisms are organisms that can be seen magnified by instuments like microscope but organisms are ones that can be seen by our eyes or by using other intruments.
What is difference between visible and invisible?
Visible means able to be seen with the naked eye or detectable, while invisible means unable to be seen or detected. Visibility refers to the state of being visible or able to be seen, while invisibility refers to the state of being unseen or undetectable.
What is difference between coherency and consistency?
Coherence insures that writes to a particular location will be seen in order. • Consistency insures that writes to different locations will be seen in an order that makes sens
