B2.1 BE unit 6.3 tenses

Explain the difference between these 2 sentences : I wrote a bunch of emails this morning and I have written a bunch of emails this morning.

Make a sentence with since 2021

My supervisor has given me feedback about my presentation yet correct or no?

ask me : ever / fail a student

I have seen John yesterday. correct or not ?

Make a sentence : I / not see him recently

Make a sentence with already

Is it ok to say : Shakespeare wrote Hamlet ; without specifying the year

make a question with following elements : How many jobs / change / so far

Make a question with used to about present habit

Ask me a question: How long / live / New Belgrade?

I am working in my current company for last 7 years. This sentence will make Monika happy or give her motivation to seriously hurt you.