1.I left Japan ten years ago

=>It......................is ten years since I left Japan..............(since)

2.My father started washing his car in the morning

=>My father...................has washed his car since the morning......................(since)

3.Tom has been collecting stamps since he was a kid

=>Tom......................began collecting stamps when he was a kid.............................(when)

4.It has been two months since my arrival in Tokyo

=>I........................arrived in Tokyo two months ago...............................(ago)

5.He died three years ago

=>He.......................has been dead for 3 years.................(been)

6.She started planting roses at half past seven

=>She..........................has planted roses since half past seven....................................(since)