现在完成时造句

I have been to Shanghai for three times.
Computer has been invented for centuries.
China has changed a lot since 1978.
So far I have made quite a few friends here.
I have adapted myself to the new environment as soon as possible.
哎呀～其实我造的句子特别地不高级　TAT　但是现在完成时造句大概就是这样～你可以自己造个看看＾＿＾

I have read this book.

I have learned 200 English words since I studied English

He has lived here since 1949.

I've finished my homework