1. Disagree, required and needed are equally clear.
2. Mastery is gender neutral. Perhaps your grammar checker is confusing this with master?
3. Rules of what is and isn't formal have changed. Contractions such as wasn't, isn't are perfectly fine.
These are just nits. Not at the same level as using compromised instead of comprised. Edit: Actually this is a non-issue, I responded to the assertion "...As long as you understand what the person is saying it's good enough...".
Your reading comprehension skills need serious work.
These are just nits. Not at the same level as using compromised instead of comprised. Edit: Actually this is a non-issue, I responded to the assertion "...As long as you understand what the person is saying it's good enough...".
Your reading comprehension skills need serious work.