Question

chuyển từ thì quá khứ đơn sang thì hiện tại hoàn thành
bài 1
my boss gave my some money for by birthday
students are doing some experiments now
he can tell you the truth
the painter há painted many nice pictures
bài 2 
we started playing tennis when i was 12 year old
they began eating 2 hours ago
we last looked for her when she lived here

Answer 1

bài 1
my boss has given my some money for my birthday
students have done some experiments 
he has told you the truth
the painter has painted many nice pictures
bài 2 
we has played tennis since i was 12 year old
they have eaten for 2 hours
we have looked for her since she lived here