Do not mix them up
der Becher
A Tasse typically has a handle; a Becher may have none.
cup
/ˈtasə/Die Tasse dampft mit heißem Tee auf dem Schreibtisch. The cup steams with hot tea on the desk. | Case | Singular | Plural |
|---|---|---|
| nominativ | die Tasse | die Tassen |
| akkusativ | die Tasse | die Tassen |
| dativ | der Tasse | den Tassen |
| genitiv | der Tasse | der Tassen |
Vessels and kitchen containers ending in -e are generally feminine (die Tasse, die Schale, die Kanne, die Pfanne).
eine Tasse Kaffee
nicht alle Tassen im Schrank haben

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The word in real life
Tasse is a small drinking vessel with a handle. It can also measure its contents: eine Tasse Kaffee.
Do not mix them up
A Tasse typically has a handle; a Becher may have none.
A tiny dialogue
Mia: Möchtest du noch eine Tasse Tee?Would you like another cup of tea?
Felix: Sehr gern, danke.Yes, please, thank you.
Seen through different eyes