There are many occasions that I dont know why people use past tense instead of present tense. As for example, arround three years ago when the then 6 years old Connie Talbot sang Over The Rainbow at The Britain's Got Talent Show, Simon said, "I thought you were fantastic!" The other judge said, " I thought you've sung that beautifully."
They gave those comments right after that girl had sung the song. Why didn't they use 'think' instead of 'thought'?
By the way, am I allowed to post that link here? (It is a four minutes youTube link)
Top answer
They could have used either, but obviously they were looking back and examining their own reactions in the past. Yes, you certainly can link that Connie Talbot song-- it is indeed fantastic!
— Mister Micawber
Free · every Monday
Get the Weekly English Kit 📬
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Sometimes it's just a matter of the way the speaker is looking at things:
"I thought you sang that beautifully." = This is the opinion I formed based on the way you sang. (This looks more at the formation of the opinion. I would expect that opinion to still be valid.)
"I think you sang that beautifully." = This is my opinion of your performance