1-My father couldn’t swim when he was twelve but swim could now

2-I could ride a bicycle when I was six years old but ride a bicycle could’nt now

3-I could’nt swim when I was four years old but swim could now

4-My father could speak five languages but two could speak now

5-He could play volleyball at university but paly volleyball could’nt now

6-I couldn't speak German fluently before I took the course but german fluently could now

7-She could’nt cook when she was ten but cook could now

8-They could run fifty kilometres when they were young but run could’nt now

9-He could run so fast in his childhood but run could’nt now

10-When he was young, he could work all day long but work could’nt now

11-When she was five, she could read and write but read and write could’nt read and write now