“used to加不定式”表示过去常常干某事，现在不在干了。例如:
I used to go to work by bus. Now I take a taxi.
She used to be very shy.
“be used to doing”表示习惯于干某事。
【例如】
I am used to getting up early and going to bed early.
He is used to being praised by others.
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