4. It would be great if you could get back in shape in time for the World Cup.

点睛　

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。
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'll never be in shape until you eat less and take more exercise. 只有少吃多锻炼你才能保持体形健美。
in time for sth. 的意思是“及时赶上某事物”。如：
I arrived just in time for the meeting. 我刚好及时赶上了开会。

听音解惑　

back⌒in［bæk⌒in］里面的［k］与［i］相邻，读作［bæ kin］；shape⌒in［ʃeip⌒in］里的［p］与［i］相邻，读作［ʃei pin］。