any differences?

I'm happy to have visited Kyoto in the spring when it's so beautiful there

A)I'd be delighted if someone would show me how to get there so I could see Kyoto in the springtime (b) I can easily imagine how beautiful Kyoto must be in the springtime (c)As I made that leap over the last barrier I could easily imagine what Kyoto looks in the springtime; since it is to the west, isn't it (d) In mind's eye I could just see my buddy Kyoto leaping over that dead tree

Ahhh, but we've synchronized, haven't we !


Ah, partner, but didn't we synchro well that time !

Given our outstanding success the lilacs are now in bloom throughout the city, while I can only hope we set an example that will inspire others, to flower the trees for instance

"I've seen Kyoto in spring" implies a completed action.
"I could see Kyoto in spring" implies a possible action.

"You've come at a good time" implies a completed action.
"You came at a good time" implies a past action.

They are all grammatically correct. They all make sense. They all have different meanings.

Thanks for your time to reply!

Thanks for your clear explanation!
Your reply is exactly what I wanted! I appreciate it :-)

Number 2 is grammatically incorrect. I'll venture a guess that you are a Japanese national and you have been taught that 'could' is the past tense of 'can'. It is not.

I'm so glad that (2) I could see Kyoto in spring. X

I'm so glad that (2) I was able to see Kyoto in spring. OK




Number 1, using 'have +PP, can 1) add a measure of politeness; 2) add a measure of importance/the hot topic/the relevance of this past, usually a recent past action that has current relevance.

Much as I've enjoyed your flurry of activity today, I'd venture that you've inadvertently fallen on your sword.

There is nothing wrong with "I'm so glad I could see Kyoto in the spring".