Unit 9's main grammar is 'Present Perfect'.
When do we use this tense?
Please study the tense reading this explanation.
Click here to see the grammar explanation.
Now please do some simple exercises.
Click here.
If you have grammar book please study with this tense. Present perfect tense is very important!!
If you don't have any good books, please open your text book (Lets talk2) to page 110~111 and do the exercises there.
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