In Essays^x, Simple past^x, Past perfect^x

Hi, I wonder what are the differences between these sentences? Here are a a few brief comments. The repetitious use of the gerund 'writing' + the verb 'write' in the same sentence is poor style. Let's talk about an essay instead. This is an essay that I have written. Suggests the essay has...

It is more formal to use the past perfect in reported speech, speaking of a previous event. I would suggest you use it in essay-writing, but not worry about it in conversation, as either is acceptable, and 'came' is probably the more common.

Mirium, I appreciate your informative reply. I hope all my following sentence are grammatically correct regardless to any aspects of context or sense. Let me know if you found a flaw. He may look up the word in the dictionary. He might look up the word in the dictionary. He could look...