This sound is used in words like veer (feather), veel (much/many/a lot) and leren (learn).
The pronunciation of this sound differs from exercise 3, although the spelling is the same. It is not a diphthong, so there is no movement of the tongue or mouth. Start saying the ‘i’ in the British English word ‘lip’. Then prolong this sound a little.
Now you should be able to pronounce the sound ee.