how long ,how far ,how often ,why

They have been in China for three years.作时间状语

How long have they been in China?

他们在中国多少时间了？

It is about 1000 kilometers from Beijing to Xi’an.

How far is it from Beijing to Xi’an?

从北京到西安有多远？

They come to visit me once a week.

How often do they come to visit you?

他们多久去看望你一次？

She came late,because she missed the bus.

Why did she come late?

她为什么来晚了？

How long have they learned English?

他们学英语多长时间了？

How often do you watch movies?

你多长时间看一次电影？

How far is it from your house to your school? （注意和home的区别）

从你家到你学校有多远？

每日一句：One is never too old to learn. 活到老，学到老。