The pen (that/which) tony bought yesterday is yellow. The girl who/that is singing is Kate. The question (that/which) he asked is not difficult. The film (that/which) we saw just now is boring. 括号里的内容可以省略
3.He asked that the issue is not difficult 1.Tony yesterday to buy the support that is a yellow pen 2.Is that the girls are singing Kate 4.We just see the movie disappointed to see that