現在完成時的句子 大家知道多少呢

1、He has turned off the light。他已把燈關了。

2、Have you found your pen yet?你已找到你的鋼筆了嗎?

3、He has lived here since 1978。自從1978年以來,他一直住在這兒。

4、I have been in the army for more than 5 years。我在部隊已經呆了五年多了。

5、I have heard nothing from him up to now。到目前為止我沒有他的任何消息。