The Most Common Mistake Students Make in the SAT and the ACT Punctuation.
again, remember that the word "however" is not FANBOYS and does not have the power to connect two sentences.
I called him, however, he did not answer.
This error can be simply fixed by using a semicolon or period.
I called him; however, he did not answer.
I called him. However, he did not answer. Or by replacing "however" with a contrasting conjunction from FANBOYS. I called him, but he did not answer.
I called him, yet he did not answer.
It is perfectly fine to use the word "however" this way, though:
I, however, was wrong.
In this case, "however" is not connecting two sentences.
Likewise, words like “Nevertheless, Even so, Consequently, Therefore” create a comma splice error when they are not punctuated properly.
I called him, nevertheless, he did not answer.
I called him, even so, he did not answer. I called him, consequently, he called me back. I called him, therefore, he called me back.