accustom oneself to doing为什么是you must accustom yourself to getting up early.而不是you must accustom yourself to get up early

accustom oneself to doing为什么是you must accustom yourself to getting up early.而不是you must accustom yourself to get up early
accustom oneself to doing
为什么是you must accustom yourself to getting up early.而不是you must accustom yourself to get up early

accustom oneself to doing为什么是you must accustom yourself to getting up early.而不是you must accustom yourself to get up early
这里to是介词,介词后面跟动词ing形式.