1. Learning English is difficult for old people. => It's challenging for elderly individuals to learn English.
2. I spent three years at high school and then I went to university. => After I finished three years of high school, I proceeded to university.
3. Tom is so tired now. If he weren't so tired, he would go for a walk. (Complete the sentence.)
4. All the guests enjoyed themselves at the party apart from George. => George was the only guest who didn't enjoy himself at the party.