2. -> This is the first time I have eaten this kind of food 

 Công thức : S+ have/has not + P2 + before -> This is the first time + S + have/has + Vpp

3 -> It has rained for an hour. 

Công thức: S + started / began + V-ing / to-V -> S + have PII / have been + V-ing

5 -> I began studying English three years ago 

Công thức: S + started / began + V-ing / to-V -> S + have PII / have been + V-ing 

8 -> We have living here for fifteen years 

 Công thức: S + started / began + V-ing / to-V = S + have PII / have been + V-ing

12. -> Minh has collected stamps since 2000 

 Công thức: S + started / began + V-ing / to-V = S + have PII / have been + V-ing

II.
 1 -> He hasn't gone abroad before.
 Công thức: S+ have/has not + P2 + before -> This is the first time + S + have/has + Vpp

2 -> She has driven for 1 months 

 Công thức: S + started / began + V-ing / to-V -> S + have PII / have been + V-ing