:
How often do you go to the dentist? – I go every six months.
4． 表示将来
这种用法往往用于谈论时间表、节目单或日程表上所安排好的事情的时候：
The exhibition opens on January 1st and closes on January 31st.
The concert begins at 7.30 and ends at 9.30.
现在进行时
（一） 现在进行时的形式
现在进行时由be的现在式+现在分词构成。
I am
You are
He is
She is
