1 writing 因为like doing
2 swimming 因为be good at doing
3 Are reading 因为be good at doing
4 likes playing 因为Bob是单数 like doing
5 likes playing 因为Bob是单数 like doing
6 teach 因为can是情态动词 后加 do
7 speak 因为can do
8 to do 因为want to do
9 wants to join 因为Joe是单数 want to do
10 to buy 因为want to do