2. He started to play the piano in 1990. He has ............................................. 3. My father stopped smoking five years ago.  My father hasn’t ............................................... 4. You began to study English last year.  You have ............................................. 5. I last visited my friend in Nha Trang in December.  I haven’t ..............................

2. He started to play the piano in 1990

→ He has started playing piano since 1990.

3. My father stopped smoking five years ago

→ My father hasn’t smoked since last five years.

4. You began to study English last year

→ You have studied English since last year.

5. I last visited my friend in Nha Trang in December

→ I haven’t visited my friend in Nha Trang since December.

NOTES :

     - S + started/began + Ving/Vinf = S + have / has + Vp2 ( thì HTHT )

     - S + stopped V-ing + last ..... = S + haven't / hasn't + Vp2 ( thì HTHT )

                                         @changg