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1. It is very fast, but it is very
expensive.
plane
2. It travels along a fixed route(路线） and has many stops to let people get on and off.
bus
3. Thousands of people travel to work
on it every day, it is faster than a bus
but not expensive.
underground
4. It is a kind of bus , it usually travels between two cities.
coach
How did Millie’s dad use to go to school?
Why didn’t he take a bus?
He used to go to school by bike.
Because there were too many people and it took a long time to wait for the next one.
1.used to do sth. 过去常常做某事
e.g. He used to ______ (share) food with me.
be used to doing sth. 习惯于做某事
我习惯于早上六点起床。
e.g.I am used to getting up at six in the morning.
他习惯照顾自己。
e.g.He is used to looking after himself.
be used to do sth 被用来做某事
这把刀子是用来切面包的。
e.g.This knife is used to cut bread.
share
2. past n.
e.g. In the past（从前）, he was an artist.
3. present n. at present =now
e.g. Tom is watching TV at present.