嗯……英语的八大时态及应用?很纠结啊……

1）一般现在时
When does Tom leave home every day?
At 7.
2)一般过去时
When did Tom leave home yesterday?
At 7.
3)一般将来时
When will Tom leave home tomorrow?
At 7.
4)过去将来时
When would Tom leave home yesterday?
At 7.
5)现在进行时
When is Tom leaving home?
At 7.
6)过去进行时
When was Tom leaving home?At 7.
7)现在完成时
How long has Tom been away from home?
For 7 hours.
8)过去完成时
How long had Tom been away from home before yesterday?
For 7 days.