https://www.youtube.com/watch?v=UXNXXhegNiQ

1. PREFIX
subject:English
Topic:prefix pronouns

2. PREFIX
A prefix is a letter or a group of letters added at the Beginning of a
word with a different meaning. Prefixes can,for example,create a new
word oppsite in meaning to the word to which a prefix is attached.
For word unhappy consists to the prefix un – which means not
combined with the root word happy , the word unhappy means not
happy.
The most common prefixes are:
Un,dis,non,anti,il,ir,semi,de,pre,im,mis,tri etc.

3. Exercise:1

4. exercise 2: