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saw is correct because action is not going on. And we use yesterday in past simple tense.
The past simple is definitely the correct tense in the above situation. But why isn't present perfect right?
With these time indicators: yesterday, the day before yesterday, when I was a child, last Tuesday, a fortnight ago etc. we must use the past simple.
I saw them yesterday, this is right sentence.
bcoz here is mantion yesterday, thts why we use Past Simple..
I have selected the first one
because of ( yesterday ) ,
but if you want to seletc ( have seen )
yesterday must be removed .
Past simple, indeed. because there a specific time. But, present perfect is used to emphasis the action and with no specific time. I hope I helped you.
Yes, we can. And I am sorry that I cannot correct the typos in my original post.