Formal vs. informal letters

Материал для изучения
Keep me posted.
Informal Neutral Formal
Asking for action
Can you see to it? Could you please act quickly to .. I would be grateful if you could
Promising action
I'll make sure We'll replace it We will of course
Don't worry. I'll get onto it. I'm sure we can find a solution.

I can assure you that

Asking to be contacted/updated
Please let me know what you plan to do.

Please could you keep me informed of

Sorry about that. I’m very sorry about Please accept our sincere apologies
Ми працюємо, сплачуємо податки та допомагаємо один одному

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IELTS Tips & Practice Tests (General Reading)