（S ）he goes to a paety at his friend's house.S开头 大写!

（S ）he goes to a paety at his friend's house.S开头 大写!
（S ）he goes to a paety at his friend's house.
S开头 大写!

（S ）he goes to a paety at his friend's house.S开头 大写!
Sometimes

这个应该是表示可能是he他，或是she她吧。

sometimes