根据括号内的要求改写下列句子。
1. I don't know Japanese, so I can't talk to the Japanese. (改为同义句)
________ I ________ Japanese, I would talk to the Japanese friends.
2. I was so anxious that I couldn't sleep. (改为同义句)
I was ________ anxious ________ sleep.
3. He didn't realize the dangers of the situation at all. (改为同义句)
He didn't realize the dangers of the situation ________.
4. We should allow twenty - year - olds to drive a car. (被动语态)
Twenty - year - olds ________ to drive a car?
5. If I don't permit, you can't use my dictionary. (改为同义句)
You can't use my dictionary ________.