EAP 140 AM - WANG, Lingshan - Week 7 2/4

We should add the article(a,an,and the) in where is necessary for grammatical completeness. 

e.g. 
    1) I bought an iphone and case yesterday. (wrong)

        I bought an iphone and a case  yesterday. (right)

     2)I need book which in the booklet. (wrong)

        I need the book which in the booklet. (right)

Although and but can't appear in one sentence at same time.  Because and so cannot appear in one sentence at same time.  If and so can't appear in one sentence at same time as well.

e.g. 
3)Although I finish my homework, but I can't play video game. (wrong)

  Although I finish my homework, I can't play video game. (right)
4)Because the weather is so bad, so I won't go outside today.(wrong)
   Because the weather is so bad, I won't go outside today. (right)