同义句改写。
My teacher said to us,
My teacher ________ us ________ ________ play in the street.
To learn English well is very difficult.
________ difficult ________ learn English well.
The camera is so expensive that I can't buy it.
The camera costs ________ ________ ________ I can't buy it.
My grandfather is too old to travel around.
My grandfather is ________ old ________ he ________ travel around any ________.
请按要求变换下列句式，每空一词。
It is hard to climb that mount,aim
________ ________ that mountain is hard.
I decided to write about nature.
________ did you decide to ________?
Why don't you join us?
________ ________ join us?
We visited a lake last year.
________ ________ you visit a lake?
句型转换，每空一词。
I'll tell you when she comes here.
I'll tell you ________ ________ ________ she comes here.
It took her two hours to finish the work.
________ ________ ________ it take her to finish the work?