The sentence "I completely understand your situation" is correct and usable in written English. You can use it when someone has shared their thoughts, feelings, or circumstances with you, and you want to express your understanding of those. For example: "I know this has been a difficult time for you. I completely understand your situation."
You are a clever man with a strong world view and I completely understand your reticence and criticism.
Benjamin Gorman, Salem, Ore . I completely understand your point about the inherent xenophobia implicit in the hubbub about the port purchase.
I completely understand your difficulties and believe that your feelings are valid.
I completely understand your reaction to all this.
I am not sure that I can completely understand your comments.
Your peers understand your situation.
You asked me to help you sort through problems caused by your leaving the institution without your Ph.D. I completely understand and empathize with your situation and I wish that I would have been able to speak with you before you made the final decision.
Farrow said in the email: "I completely understand and share your frustration.
In reply, Cameron told Burns he would "certainly be missed, but I completely understand and respect your decision".
I completely understand if you insist on your zero tolerance towards princesses stance.
Hi Robin, I totally understand your confusion surrounding this story, but can now clarify the situation.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.