to work
The German word 'arbeiten' is a verb that corresponds to the English word 'work'. It is used to describe the act of doing a job or performing a task. It can be used in various contexts, such as 'Ich arbeite im Büro' (I work in the office) or 'Er arbeitet hart' (He works hard). It is a regular verb in German, with the infinitive form being 'arbeiten' and the past participle being 'gearbeitet'.
I have to work today.
This sentence is in the present tense and it's a first person singular form. 'Ich muss' means 'I have to', 'heute' means 'today', and 'arbeiten' is the infinitive form of the verb 'to work'.
They are working now.
This sentence is in the present tense and it's a third person plural form. 'Sie' means 'they', 'arbeiten' is the infinitive form of the verb 'to work', and 'jetzt' means 'now'.
We want to work tomorrow.
This sentence is in the present tense and it's a first person plural form. 'Wir wollen' means 'we want', 'morgen' means 'tomorrow', and 'arbeiten' is the infinitive form of the verb 'to work'.