6) It has rained heavily for an hour 
--> It started raining an hour  ago
7) I have had a good English result since last month 
--> I began having a good English result last month 
8) I started being able to swim when I was ten
--> I have been  able to swim since I was ten
9) When did you start learning English?
--> How long have you started  learning English?
10) Nam is as tall as his order sister
--> Nam is the same. height as his order sister