Der Stamm ist leicht zu erkennen, wenn du zuerst die Wortart bestimmst.

In everyday German, der Stamm can indeed mean trunk or stem of a tree. But in grammar and linguistics, der Stamm means the word stem, the basic part of a word before endings are added.

For example:

• spiel- is the stem in spielen, spielt, gespielt
• Kind- is the stem in Kinder, Kindes

So in this sentence, der Stamm means the stem of a word, not part of a tree.

Here der Stamm is the subject of the sentence, so it is in the nominative case.

The main clause is:

• Der Stamm ist leicht zu erkennen.

The thing that is easy to recognize is the stem, so der Stamm is the subject.

Cases for this noun would be:

• der Stamm = nominative
• den Stamm = accusative
• dem Stamm = dative

Since it is the subject, nominative is correct.

This is a very common German structure:

• leicht = easy
• zu erkennen = to recognize / to identify

So leicht zu erkennen means easy to recognize or easy to identify.

The pattern is:

• sein + adjective + zu + infinitive

Examples:

• Das ist schwer zu sagen. = That is hard to say.
• Die Aufgabe ist leicht zu lösen. = The task is easy to solve.
• Der Stamm ist leicht zu erkennen. = The stem is easy to recognize.

This is much more natural in German than trying to translate English word-for-word.

Because after adjectives like leicht, schwer, einfach, schwierig, German often uses zu + infinitive.

So:

• leicht zu erkennen = easy to recognize
• schwer zu verstehen = hard to understand
• einfach zu lernen = easy to learn

Using just erkennen here would be ungrammatical.

Because when German uses zu + infinitive, the infinitive usually goes at the end of its phrase or clause.

So:

• leicht zu erkennen
• schwer zu erklären
• einfach zu finden

This is normal German word order. English learners often want to place the verb earlier, but German usually saves infinitives for the end.

They are related, but not the same.

• kennen = to know, be familiar with
• erkennen = to recognize, identify

Examples:

• Ich kenne das Wort. = I know the word.
• Ich erkenne den Stamm. = I recognize the stem.

In this sentence, erkennen is used because the idea is identifying the stem, not simply being familiar with it.

Because the second part begins with wenn, which creates a subordinate clause. In German subordinate clauses, the conjugated verb usually goes to the end.

Main clause:

• Der Stamm ist leicht zu erkennen

Subordinate clause:

• wenn du zuerst die Wortart bestimmst

That final bestimmst is completely normal after wenn.

Compare:

• Du bestimmst zuerst die Wortart.
  In a main clause, the verb is in second position.

• ..., wenn du zuerst die Wortart bestimmst.
  In a subordinate clause, the verb moves to the end.

Here wenn is best understood as if or when, depending on context.

In this sentence, it means something like:

• if you first determine the part of speech
• or when you first determine the part of speech

German wenn often covers both ideas where English separates them more clearly.

A useful rule:

• wenn can mean if for repeated or general conditions
• wenn can also mean when
• falls is a more clearly conditional if

In this sentence, wenn introduces the condition under which recognizing the stem is easy.

Die Wortart means part of speech or word class.

Examples of Wortarten are:

• Nomen = noun
• Verb = verb
• Adjektiv = adjective
• Pronomen = pronoun

So die Wortart bestimmen means to identify what kind of word it is.

It is accusative, because it is the direct object of bestimmen.

The verb bestimmen means to determine / identify, and here the thing being determined is the part of speech:

• du bestimmst die Wortart

Since Wortart is a feminine noun, nominative and accusative both use die:

• nominative: die Wortart
• accusative: die Wortart

So the form does not change, but the function is accusative here.

Yes, man would also be possible, but it would sound more general.

This sentence uses du, which is very common in explanations, textbooks, exercises, and teaching materials. It speaks directly to the learner:

• wenn du zuerst die Wortart bestimmst

That means if you first determine the part of speech.

A more general version would be:

• Der Stamm ist leicht zu erkennen, wenn man zuerst die Wortart bestimmt.

That means something like The stem is easy to recognize if one first determines the part of speech.

In English, man often sounds formal, but in German it is very common.

Here bestimmen means to determine, to identify, or to figure out.

So:

• die Wortart bestimmen = determine the part of speech

In grammar explanations, bestimmen is a very common verb. You will often see things like:

• Bestimme das Subjekt. = Identify the subject.
• Bestimme den Kasus. = Determine the case.
• Bestimme die Wortart. = Determine the part of speech.

Zuerst means first, and here it modifies the action bestimmst.

So the idea is:

• if you first determine the part of speech

The word order is natural German:

• wenn du zuerst die Wortart bestimmst

You could move elements around for emphasis, but this version is the most neutral and natural for instructional language.

Yes. German often allows several natural alternatives. For example:

• Der Stamm lässt sich leicht erkennen, wenn du zuerst die Wortart bestimmst.
• Man kann den Stamm leicht erkennen, wenn man zuerst die Wortart bestimmt.
• Wenn du zuerst die Wortart bestimmst, ist der Stamm leicht zu erkennen.

All of these are grammatically correct, but the original sentence is clear and natural, especially in a teaching context.

Yes. It has a very common German pattern:

1. Main clause first
   • Der Stamm ist leicht zu erkennen
2. Subordinate clause with wenn
   • wenn du zuerst die Wortart bestimmst

So this sentence is a good example of two important structures at once:

• sein + adjective + zu + infinitive
• subordinate clause with verb at the end

That makes it a very useful model sentence for learners.