used to 意思是过去常常，后面接动词原形，用于疑问句或否定句时写成 use to,如 did...use to 或 he didn't use to ;
be used to 意思是习惯于，后面接名词或动名词。
Did he use to wear glasses?
他过去常戴眼镜吗？
He didn't use to smoke.
他过去不常吸烟。
She has been used to the climate there.
他已经习惯了那儿的气候。
He has been used to getting up early.
他已经习惯早起了。
