Respuestas
1:
a) she was surfing when the shark attacked her
b) he was dancing when he met his girlfriend
c) I was having a picnic when I saw my sister
d) when they saw the shark they were swimming in the sea
e) susan arrived when I was having dinner
f) he was playing football when he broke his leg
g)I was waiting for my friend when the bus arrived
h) when I got back my mum was cooking dinner
2:
a) did you do
b) went
c)did you
d) enjoyed it
e)met
f) was talking
g) asked
h)lives
i) does he know?
j) go
k) are
l) are going
3:
a) where have you been?-I have been
b) Have you had breakfast?-Yes I have
c) Has the post come?-Yes it has
d)Have you seen my watch?-No I'm afraid I haven't
e) Someone has wound the clock?-Yes, Tom has
f)I haven't finished my letter yet
g) He has just gone
h)Someone has taken
i)The phone has stopped ringing
j)Have you heard from her?-No I haven't
1A) She was surfing when the shark attacked her
1B) He was dancing when he met his girlfriend
1C) I was having a picnic when I saw my sister
1D) When they saw the shark they were swimming in the sea
1E) Susan arrived when I was having dinner
1F) He was playing football when he broke his leg
1G) I was waiting for my friend when the bus arrived
1H) When I got back my mum was cooking dinner
2A) Did you do
2B) Went
2C) Did you
2D) Enjoyed it
2E) Met
2F) Was talking
2G) Asked
2H) Lives
2I) Does he know?
2J) Go
2K) Are
2I) Are going
3A) Where have you been? - I have been
3B) Have you had breakfast? - Yes, I have
3C) Has the post come? - Yes, it has
3D) Have you seen my watch? - No, I'm afraid I haven't
3E) Someone has wound the clock? - Yes, Tom has
3F) I haven't finished my letter yet
3G) He has just gone
3H) Someone has taken
3I) The phone has stopped ringing
3J) Have you heard from her? - No, I haven't
¡Espero que te haya servido! Saludos :)