1. used to do sth.;be used to doing sth.和be used to do sth.的区别
辨析：used to do sth.表示过去常常做某事.
e.g. I used to get up at six in the morning.
be used to doing.表示习惯做某事，to 后的动词用-ing形式
e.g. I'm used to getting up early.
be used to do sth. 指被用来做什么。
e.g. Pens are used to write.
2. arrive, get 和reach的区别
辨析：arrive in +大地点，arrive at+小地点，get to+地点名词，reach是及物动词，后面直接跟地点名词。
e.g. When did you arrive in Beijing?
We arrived at the village at five in the afternoon。
How do you usually get to school?
When she reached the office, the teacher was having a short rest.