
ein
one
Indicates the number one.
Für das Rezept brauchst du ein Ei und zwei Eigelb.
For the recipe, you need one egg and two egg yolks.
one
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one
Indicates the number one.
Für das Rezept brauchst du ein Ei und zwei Eigelb.
For the recipe, you need one egg and two egg yolks.

one
Emphasizes that there is exactly one person or thing. When spoken, the word receives particular emphasis.
Nicht ein einziger Gast ist gekommen.
Not a single guest came.

one
Expresses that several people or things agree on something or have something in common.
In dieser Frage sind wir alle einer Meinung.
We are all of the same opinion on this matter.

one and the same
Emphasizes that exactly the same person or thing is meant.
Beide Briefe wurden von ein und derselben Person geschrieben.
Both letters were written by one and the same person.

all in one
Expresses that someone or something combines several tasks, qualities, or functions at the same time.
Dieses Gerät ist Drucker und Scanner in einem.
This device is a printer and scanner all in one.

on the one hand … on the other hand
Introduces two different aspects or reasons that both need to be taken into consideration.
Zum einen ist die Wohnung zu teuer, zum anderen liegt sie zu weit von meiner Arbeit entfernt.
On the one hand, the apartment is too expensive; on the other hand, it is too far from my workplace.

once and for all
Finally and in such a way that a matter will not need to be dealt with again in the future.
Wir müssen diesen Streit ein für alle Mal beenden.
We have to end this argument once and for all.

time and time again
Again and again; on numerous successive occasions.
Der Torwart verhinderte ein ums andere Mal ein Gegentor.
Time and time again, the goalkeeper prevented a goal.

to be inseparable
To get along very well and be closely connected to each other.
Die beiden Schwestern sind ein Herz und eine Seele.
The two sisters are inseparable.
Use „ein bis zwei“ (one to two) to give an approximate quantity. The following noun is plural.
Die Reparatur dauert wahrscheinlich ein bis zwei Stunden.
The repair will probably take one to two hours.
The combination „auch nur ein“ (even just one) emphasizes a particularly small quantity, often in questions or negative statements. You can use „ein einziger“ (a single one) to emphasize the number even more.
Hast du auch nur einen einzigen Moment an mich gedacht?
Did you think of me even for a single moment?
Learn the pattern „mit jemandem einer Meinung sein“ (to be of the same opinion as someone). The person you agree with follows „mit“ (with) in the dative.
Bei diesem Thema bin ich mit meinem Bruder einer Meinung.
I am of the same opinion as my brother on this issue.
„Ein und derselbe“ (one and the same) can come before a noun. The form „ein und dasselbe“ (one and the same thing) can also stand alone when the context makes it clear what it refers to.
Wir fahren jeden Morgen mit ein und demselben Bus.
We take one and the same bus every morning.
Du erzählst mir ständig ein und dasselbe.
You keep telling me one and the same thing.
„In einem“ (all in one) often comes after a list of roles or functions and refers to the entire list. The expression stays unchanged even when several functions are mentioned.
Sie ist Trainerin, Beraterin und Organisatorin in einem.
She is a coach, advisor, and organizer all in one.
When „zum einen“ (on the one hand) and „zum anderen“ (on the other hand) each stand at the beginning of a main clause, the conjugated verb follows them directly. The subject then comes after the verb.
Zum einen fehlt uns die Zeit, zum anderen brauchen wir mehr Geld.
On the one hand, we lack the time; on the other hand, we need more money.
„Ein für alle Mal“ (once and for all) is often used with „klären“ (to clarify), „beenden“ (to end), or „erledigen“ (to settle). The expression gives particular emphasis to a demand or decision.
Ich möchte diese Frage heute ein für alle Mal klären.
I want to settle this question once and for all today.
„Ein ums andere Mal“ (time and time again) is particularly typical of written narratives and reports. The expression clearly emphasizes repetition and sounds emphatic.
Ein ums andere Mal scheiterte das Team an derselben schwierigen Aufgabe.
Time and time again, the team failed at the same difficult task.
Learn „ein Herz und eine Seele sein“ (to be inseparable) as a fixed unit with both nouns and their accompanying words. The verb agrees with the subject, which often refers to several people.
Schon nach wenigen Tagen waren die beiden Kinder ein Herz und eine Seele.
After just a few days, the two children were inseparable.