Meine Schwester möchte auch mitkommen.

Because Schwester is a feminine noun in German: die Schwester.

The possessive word mein changes its ending depending on the gender, number, and case of the noun that follows it. In the nominative singular feminine, it becomes meine.

So:

• mein Bruder = my brother
• meine Schwester = my sister

In this sentence, meine Schwester is the subject, so it is in the nominative case.

In German, all nouns are capitalized, not just proper names.

So:

• die Schwester
• das Haus
• der Hund

That is why Schwester begins with a capital S.

Möchte is commonly used to express would like to.

So Meine Schwester möchte auch mitkommen means that your sister would also like to come along.

Grammatically, möchte is historically related to mögen, but learners usually treat it as a very common polite form meaning would like.

Compare:

• Ich will gehen. = I want to go.
• Ich möchte gehen. = I would like to go.

Möchte often sounds softer or more polite than will.

Because möchte behaves like a modal verb here.

In a main clause with a modal verb, German usually puts:

1. the conjugated modal verb in the second position
2. the other verb in the infinitive at the end

So the structure is:

• Meine Schwester = subject
• möchte = conjugated verb in position 2
• auch = adverb
• mitkommen = infinitive at the end

This is a very common German sentence pattern.

Because mitkommen is a single verb meaning to come along / to come with.

It is made of:

• mit = with, along
• kommen = to come

Many German verbs are built this way. In dictionaries, you will usually find it written as one verb: mitkommen.

When it is used as an infinitive, it stays together:

• Sie will mitkommen.

But when it is a normal conjugated main verb, the prefix often separates:

• Sie kommt mit. = She is coming along.

So:

• mitkommen = infinitive, together
• kommt ... mit = finite form, separated

Auch means also / too, and in this sentence it modifies the idea of coming along.

German adverbs like auch can move around somewhat, but their position affects emphasis.

In:

• Meine Schwester möchte auch mitkommen.

the natural meaning is My sister would also like to come along.

If you move auch, the focus can shift. For example:

• Auch meine Schwester möchte mitkommen.
  = My sister too would like to come along.

That version emphasizes that your sister, in addition to someone else, wants to come.

So word order can change what is being highlighted.

It is in the nominative case because it is the subject of the sentence.

Ask yourself: who wants to come along?

Answer: meine Schwester

That makes it the subject, and subjects are usually in the nominative case in German.

No. After a modal verb, German does not use zu.

So you say:

• Meine Schwester möchte mitkommen.

not:

• Meine Schwester möchte zu mitkommen. ❌

This is like other modal constructions:

• Ich kann schwimmen.
• Wir müssen gehen.
• Er will essen.

The second verb stays in the bare infinitive.

A rough guide is: MERKH-tuh or MURKH-tuh, but neither spelling is perfect.

Two sounds are especially important:

• ö: this is not the same as English o. It is an umlaut vowel.
• ch in möchte: this is the German ich/ach-type sound, not an English ch as in chair.

A helpful beginner approximation is:

• möch-te → something like murkh-tuh

Also note:

• the e at the end is pronounced, but lightly
• the word has two syllables: möch-te

Yes, it is a present-tense form, but its meaning is often best translated with English would like.

So even though it is present tense in German, English usually uses a more polite expression.

For example:

• Ich möchte Kaffee. = I would like coffee.
• Sie möchte mitkommen. = She would like to come along.

So do not be surprised if the German present tense corresponds to would like in English.

Yes, you can, but the meaning and tone change.

• Meine Schwester möchte auch mitkommen.
  = My sister would also like to come along.
  Softer, more polite, less forceful.

• Meine Schwester will auch mitkommen.
  = My sister also wants to come along.
  More direct and stronger.

So both are grammatical, but möchte often sounds more polite or gentle than will.

The sentence follows a very common German pattern:

Subject + finite verb + other elements + infinitive at the end

Breaking it down:

• Meine Schwester = subject
• möchte = finite verb
• auch = adverb
• mitkommen = infinitive

So the overall structure is:

Meine Schwester | möchte | auch | mitkommen.

This is the kind of pattern you will see often with modal verbs in German.