Q:

The major points of the lesson were quickly learnt by the class, but they were also quickly forgotten by them. 

• 1
  The class quickly learnt but forgot the major points of the lesson.
• 2
  The class quickly learnt the major points of the lesson but they also forgot them.
• 3
  The class learnt and forgot the major points of the lesson quickly.
• 4
  The class quickly learnt the major points of the lesson but also forgot them quickly.