Contact me is more formal. Get in touch is casual that's only good if you are talking with friends. However, contact us is better if you are working for a company or if you are in a team.
To use the modal verb 'must' when you talk about the past.
When do you use mich vs mir? Also why is it "Mir ist kalt" instead of "Ich bin kalt"?
Generating questions for collocations
What does "before it fades to black" mean?
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