The answer to your question would be that he punctuation mark that should be used in each sentence is the following one:
- I do not like potatoes. Hoewever, I love sweet potatoes. In this case, you could choose to start the sentence with "however" and then put a comma after it.
- Many people are confused by these punctuation marks: the colon, the semicolon, and the hyphen. In this case, the colon is used to introduce a series of items. The nouns after the colon specify the punctuation marks mentioned.
- After thinking about it for several days, I decided what I had to do- I would apologize to Mrs. Potter. The punctuation mark that should be used here is the em dash. A pair of em dashes can be used in place of commas to enhance readability.
- The day went by in an orderly fashion; there was no trouble from any of the students. In this case, the semicolon is used to join two independent clauses that are closely related.
