Complete the sentences. choose the right forms.1. do you know anybody who (have/has) been to britain and can speak about it? 2. john hasn't told us about his plans (already/yet)3. my little brother has never (swam/swum) in the sea, but he'd love to.4. everybody enjoys such (-/a) clear and fresh air.5. i am learning english because i hope it will be (useful/useless) to me.
