第4句：It would be great if you could get back in shape in time for the World Cup.
It would be great…在对话中表示“……(真是)太好了”。
if you could get back...the World Cup是由if引导的条件状语从句。
1. in shape的意思是“处于良好状态”，用于指人时特指“体态健美或身体状况良好”。如:
You'11 never be in shape until you eat less and take more exercise。
2. in time for sth.的意思是“及时赶上某事物”。如:
I arrived just in time for the meeting.