1. Forgetting to Capitalize Days
Wrong: "Ich habe am montag einen Termin."
Right: "Ich habe am Montag einen Termin."
Why: All German nouns, including days of the week, must be capitalized. This is a fundamental rule of German grammar and forgetting it is instantly noticeable to native speakers.
2. Using "auf" Instead of "am" with Days
Wrong: "Ich sehe dich auf Freitag."
Right: "Ich sehe dich am Freitag."
Why: "Auf" means "on" in spatial contexts, but with days you must use "am" (a contraction of "an dem"). English speakers often make this mistake due to direct translation of "on Friday."
3. Incorrect Use of Plural Forms
Wrong: "Am Montags gehe ich schwimmen." (mixing singular article with plural day)
Right: "Montags gehe ich schwimmen." (no article, plural form) OR "Am Montag gehe ich schwimmen." (article with singular)
Why: When using the plural form for recurring events (Montags, Dienstags), don't use the article "am." The plural form alone indicates "every Monday."
4. Mispronouncing the Final "g" Sound
Wrong: Pronouncing "Montag" as "Mon-tahg" with a soft "g"
Right: Pronounce it as "Mon-tahk" with a hard "k" sound
Why: In German, final "g" is typically pronounced as "k" (this is called "Auslautverhärtung" or "final devoicing").
5. Using "in" Instead of "am" for Days
Wrong: "Wir treffen uns in Mittwoch."
Right: "Wir treffen uns am Mittwoch."
Why: "In" is used for months, years, and seasons, but days require "am." This is a common mistake for beginners confusing temporal prepositions.
6. Incorrectly Forming Compound Time Expressions
Wrong: "Am Montag Morgen" (separate words with space)
Right: "Am Montagmorgen" (one compound word)
Why: German loves compound words. When combining a day with a time of day (Morgen, Nachmittag, Abend), write them as one word.
Pro Tip
Remember: "am" (on a specific day) vs. "-s" ending (every day). If you say "Am Montag," you're talking about one specific Monday. If you say "Montags," you mean every Monday. Never mix them: don't say "Am Montags."