potato
The German word for potato is 'Kartoffel'. It is a noun and is used in the same way as the English word 'potato'. For example, 'Ich esse eine Kartoffel' means 'I am eating a potato'.
I am planting a potato in my garden.
This sentence expresses a simple activity using the present tense. It also uses the preposition 'in' which can refer to an enclosed space ('in my garden').
The potato is the staple food in many cultures.
This is a general statement about the importance of potatoes in different cultures. It uses the noun 'Kartoffel' as the main subject of the sentence.
He forgot the potato in the oven.
This sentence tells about a past event using the auxiliary verb 'vergaß' (forgot), and makes use of the preposition 'im' (in the), which is a contraction of 'in dem'.