What does each statement express?
1/-The American tennis player Roscoe Tanner could serve a ball at 225 Km / h
2 /-Sally can’t travel alone
3/-Bill Gates could write computer programs at the age of 13
4/-I couldn’t read when I was 2
1/-ability in the past
2/- inability in the present
3/- ability in the past
4/- inability in the past
