`1` We have lived here for fifteen years. 

`2`. How long did you begin to learn English?

`3.` I haven't witten a letter to my aunt since May.

`4.` Minh has.collected stamps since 2000.

`5. `Nga has learned French for one year.

 `->` S + has/ have + Vpp+ O...+ for+ khoảng thời gian / since + mốc thời gian...

`->` How long did + S + V + O? 

1. We have started living here for fifteen years. ( S+have/has+ $P_{2}$ + for+ khoảng thời gian...)

2. How long have you begun to learn English? ( How long+ have/has + S + $P_{2}$ + ... ?)

3. I haven't witten a letter to my aunt since May. ( S+have/has+ $P_{2}$ + since + mốc thời gian+ ...) 

4. Minh has begun to collect stamps since 2000. (S+have/has+ $P_{2}$ + since + mốc thời gian+ ...)

5. Nga has started learning French for one year.  (S+have/has+ $P_{2}$ + for+ khoảng thời gian...)