1. Someone has eaten / ate all the cakes 2. Children have visited / visited their Granny...

Question

1. Someone has eaten / ate all the cakes

2. Children have visited / visited their Granny three days ago

Answer 1

has eaten

visited

 

В первом важен результат, а во втором есть явное указание на время.

Answer 2

1. Someone has eaten all the cakes  

2. Children visited their Granny three days ago