You will notice that the 'th' sound is expressed two ways. You will find it second nature soon enough how to write it. It just flows with the outlines, that's why there are two ways to write it.
'ily' and 'ally' are exactly the same size loop.
notice the odd joining in "letters". See the attachment for more information on this paragraph.
'Agree' is a large loop and above the next character.
Note the difference between "office" and "was". Notice the form 'already' and the 'o' and then think about the outline 'real', and how different they are. You can speel some brief forms asuch as 'knowledge, unless, always, list,' etc. There is a difference between 'reply' and 'represent'. You may need to spell out represent. 'r-p, represent' Note 'complain' and "keep". Notice the difference between these out outlines.
If you can't remember if a word starts with "com" or "comm", write your best guess. Since Gregg Shorthand is by sound, you may not remember the spelling in your head. You can fix it after and work on practicing the correct outline by picturing the shorthand outline and longhand.
This is where you can learn proper spelling and grammar. Maybe practice a few sentences with these words if they give you trouble on remembering when to use a single 'm' or a double 'm' in a word spelling.
This might be good to transcribe your writing as well.