used to + do："过去常常"表示过去习惯性的动作或状态，但如今已不存在。
be used to + doing： 对……已感到习惯，或"习惯于"，to是介词，后需加名词或动名词。
I am used to English.
或
It is my habit.这是我的习惯。
sorry , it is my old trouble.老毛病
I've already got used to it.
I'm getting used to it.
I am used to it.
I got used to it.
I usually do it.
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