1.I began living in ho chi minh city when I was 8
-->I have
2.She has taught the children in this remote village for five months.
-->she started
3.He hasn't written to me since April.
-->the last time
4.She hasn't had a swim for five years.
-->she last
5.They last talked to each other two months ago.
-->They haven't
6.The last time she saw her elder sister was in 1999
-->She hasn't
1.I began living in ho chi minh city when I was 8
-->I have LIVED IN HCM CITY SINCE I WAS 8.
2.She has taught the children in this remote village for five months.
-->she started TEACHING CHILDREN IN THIS REMOTE VILLAGE 5 MONTHS AGO.
3.He hasn't written to me since April.
-->the last time HE WROTE TO ME WAS IN APRIL.
4.She hasn't had a swim for five years.
-->she last HAD A SWIM 5 YEARS AGO.
5.They last talked to each other two months ago.
-->They haven't TALKED TO EACH OTHER FOR 2 MONTHS.
6.The last time she saw her elder sister was in 1999
-->She hasn't SEEN HER ELDER SISTER SINCE 1999.
1.I began living in ho chi minh city when I was 8
-->I have lived in Ho Chi Minh city since I was 8.
2.She has taught the children in this remote village for five months.
-->she started teaching the children in this remote village five months ago.
3.He hasn't written to me since April.
-->the last time he wrote to me was April.
4.She hasn't had a swim for five years.
-->she last had a swim five years ago.
5.They last talked to each other two months ago.
-->They haven't talked to each other for two months.
6.The last time she saw her elder sister was in 1999
-->She hasn't seen her elder sister since 1999.
1. I began living in Ho Chi Minh City when I was 8.
\(\Rightarrow\) I have lived in Ho Chi Minh City ince I was 8.
2. She has taught the children in this remote village for five months.
\(\Rightarrow\) She started teaching the children in this remote village five months ago.
3. He hasn't written to me since April.
\(\Rightarrow\) The last time he wrote to me was in April.
4. She hasn't had a swim for five years.
\(\Rightarrow\) She last had a swim five years ago.
5. They last talked to each other two months ago.
\(\Rightarrow\) They haven't talked to each other for two months.
6. The last time she saw her elder sister was in 1999.
\(\Rightarrow\) She hasn't seen her elder sister since 1999.