句型转换。
1. The old man was too tired to walk on.
The old man was _______ tired _______ he couldn't walk on.
2. Mike is the tallest in his class.
Mike is taller _______ ________ ________ ________ in his class.
3. I will go to bed when I finish writing the letter.
I _______ go to bed _______ I finish writing the letter.
4. It's about half an hour's walk.
It takes about half an hour to go there _______ ________.
5. Work hard, and you will get good marks.
_______ _______ work hard, you'll get good marks.
6. John was busy at 9 last night.
He was writing his English composition at 9 last night.
John _______ _______ ________ his English composition at 9 last night.
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