Ich stolpere fast über die Wurzel neben der Hecke.

Stolpern is the infinitive, meaning to trip or to stumble.

In the sentence, it is conjugated for ich in the present tense:

• ich stolpere = I trip / I am tripping / I stumble
• du stolperst
• er/sie/es stolpert

So Ich stolpere ... is simply the correct 1st person singular form.

Fast means almost.

So:

• Ich stolpere fast ... = I almost trip ...

In German, fast usually comes before the part it modifies. Here it modifies the whole action of tripping, so putting it before über die Wurzel sounds natural.

Compare:

• Ich stolpere fast über die Wurzel. = I almost trip over the root.
• Ich stolpere über fast jede Wurzel. = I trip over almost every root.

The position changes the meaning.

With stolpern, German normally uses über to say what someone trips over:

• über etwas stolpern = to trip over something

So:

• über die Wurzel stolpern = to trip over the root

Here die Wurzel is in the accusative case, because über takes the accusative in this expression.

This is a very common combination, almost like a fixed pattern:

• über einen Stein stolpern = to trip over a stone
• über eine Stufe stolpern = to trip over a step

They are different cases.

• die Wurzel is accusative singular
• der Hecke is dative singular

Both nouns are feminine, but feminine articles change by case:

• die Wurzel = nominative/accusative singular

• der Wurzel = dative singular

• die Hecke = nominative/accusative singular
• der Hecke = dative singular

So the difference is not gender, but case.

Neben is a two-way preposition. That means it can take:

• dative for a location
• accusative for movement toward something

Here, neben der Hecke describes a location: the root is next to the hedge.

So German uses the dative:

• neben der Hecke = next to the hedge

If there were movement toward that position, you would use the accusative instead:

• Ich lege den Stein neben die Hecke. = I put the stone next to the hedge.

But in your sentence, nothing is moving to the hedge; it is just located there.

Most naturally, it describes the root:

• die Wurzel neben der Hecke = the root next to the hedge

So the sentence is understood as:

• I almost trip over the root that is next to the hedge.

In theory, context could make it refer to the speaker’s location, but without extra emphasis or a different word order, native speakers will usually connect neben der Hecke to die Wurzel.

If you wanted to make it clearly refer to you, you might say something like:

• Neben der Hecke stolpere ich fast über die Wurzel.

That sounds more like Beside the hedge, I almost trip over the root.

Yes. Wurzel literally means root, and it can absolutely refer to a root sticking out of the ground that someone might trip over.

So in this sentence, it most likely means something like:

• a tree root
• a thick root from a bush or hedge
• a root protruding from the soil

This is completely natural German.

Yes. German word order is flexible, but the finite verb still has to stay in second position in a normal main clause.

The original sentence is neutral:

• Ich stolpere fast über die Wurzel neben der Hecke.

You could also say:

• Fast stolpere ich über die Wurzel neben der Hecke.
• Über die Wurzel neben der Hecke stolpere ich fast.

These versions change the emphasis, but not the basic meaning.

The original version is probably the most natural if you are just stating what happens.

German does not need an extra word like that is or which is here.

The phrase neben der Hecke can directly follow the noun and work like a compact modifier:

• die Wurzel neben der Hecke = the root next to the hedge

English works the same way here, actually:

• the root beside the hedge

So this structure is very normal in both languages.

Yes. Stolpern can mean:

• to trip
• to stumble

The exact English translation depends on context.

In this sentence, because of über die Wurzel, trip over is probably the best translation.

• Ich stolpere über die Wurzel. = I trip over the root.

If there is no object, stumble may sound more natural:

• Ich stolpere. = I stumble.

Yes. German uses the present tense much more broadly than English does.

• Ich stolpere fast über die Wurzel.

This can mean:

• I almost trip over the root
• I’m almost tripping over the root
• I nearly trip over the root

German often uses the simple present where English might prefer am ... -ing. So this is completely normal.