一般完成时用于描述在过去某一时间发生的动作，并且这个动作对现在有影响或者这个动作刚刚结束。以下是一些使用一般完成时的例句：
表示已完成的动作对现在的影响
I have studied English for 10 years.
She has traveled to five different countries.
表示一段时间内发生的动作
They have lived in this city since 2010.
The company has been developing this product for three years.
表示刚刚完成的动作
I have just finished my breakfast.
They have just arrived at the station.
表示经验或成就
I have learned to play the guitar.
She has won two national championships.
表示到达某地
I have been to France twice.
They have gone to the mountains.
希望这些例句能帮助你更好地理解和使用一般完成时。
