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Exercise 4A
Rewrite the sentences. Replace the underlined words with phrases with can / can't.
1 You are not allowed to have your mobile phone switched on.
You can't have your mo.
2 You have to register before it's possible to use the site.
3 I'm afraid it isn't possible for her to speak to you at the moment.
4 It's OK to use my computer if you want to.