Please evaluate the following sets of sentences and point out the wrong ones. Thank you.

1. I am going to skip office tomorrow and I suggest you do the same.
2. I am going skip office tomorrow and suggest you do the same.
3. I am going to skip office tomorrow; I suggest you do the same.
4. I am going to skip office tomorrow: suggest you do the same.

a. I can not go to school because I am ill.
b. I can not go to school; I am ill.
c. I can not go to school, as I am I ll.

I. You played well today. It is, however, unlikely that you will be selected by the board.
II. You played well today; however, it is unlikely that you will be selected by the board.