$1.$ The film which/that/X the class watched yesterday was about the Apollo 13 space mission.

$2.$ The astronomer who we are meeting tonight has discovered three Earth-like planets

$3.$  We read about an astronaut who travelled into space in 1961.

$4.$ When Anousheh Ansari travelled into space as a tourist in 2006, Dennis Tito had become the first space tourist in 2001.

$5.$ This is the man who works for NASA.

$6.$ I’m reading an article which is about NASA’s plans to return humans to the moon.

# No copy

$Munz$

* Which dùng để thay thế cho vật đóng vai trò là là chủ ngữ hoặc túc từ.

* Who dùng để thay thế cho người đóng vai trò chủ ngữ.

* Whom dùng để thay thế cho người đóng vai trò túc từ.

1 The film which the class watched yesterday was about the Apollo 13 spacemission.

2 The astronomer who  we are meeting tonight has discovered three Earth-like planets.

3 We read about astronaut who travelled into space in 1961.

4 When Anousheh Ansari travelled into space as a tourist in 2006, Dennis Tito had become the first space tourist in 2001.

5 This is the man who works for NASA.

6 I’m reading an article which is about NASA’s plans to return humans to the moon.