kono zubon ha sukosi nagai node, beruto wo site mo arukinikui desu.

この is a determiner, so it must come before a noun.

• この ズボン = these pants / this pair of pants
• これ is a pronoun, so it stands by itself: this

So:

• この ズボン = correct
• これ ズボン = incorrect

A useful comparison:

• この ズボン は 長いです。 = These pants are long.
• これ は ズボンです。 = This is a pair of pants.

は marks the topic of the sentence.

Here, この ズボン は means something like:

• As for these pants...
• These pants...

So the speaker is introducing these pants as the thing being talked about, and then describing them:

• この ズボン は 少し 長い = These pants are a little long

This is very common in Japanese. The topic often comes first, followed by a comment about it.

少し means a little or a bit.

So:

• 少し 長い = a little long

It softens the statement. Instead of saying the pants are flatly long, the speaker says they are a bit long.

This is similar to English:

• They’re long. = stronger
• They’re a little long. = softer, more natural in many situations

You may also see ちょっと used similarly in conversation:

• ちょっと 長いです

That is very natural too, but 少し sounds a bit more neutral or slightly more formal.

長い means long.

With clothing, it can describe length. So if pants are too long, 長い is natural.

Examples:

• スカートが長い = The skirt is long
• ズボンが長い = The pants are long

In this sentence, it means the pants are long enough to make walking difficult.

ので means because or since.

So:

• 少し 長い ので = because they are a little long

The full sentence structure is:

• Aので、B
• Because A, B

Here:

• この ズボンは少し長いので、ベルトをしても歩きにくいです。
• Because these pants are a little long, even with a belt, they are hard to walk in.

Compared with から, ので often sounds a bit softer and more explanatory.

• 長いから = because they’re long
• 長いので = because they’re long / since they’re long

Both can be correct, but ので is often a little more polite or less blunt.

Here, する means to wear or to put on certain accessories.

With things like belts, watches, ties, glasses, and necklaces, Japanese often uses:

• 〜をする = to wear / put on ~

So:

• ベルトをする = to wear a belt
• ネクタイをする = to wear a tie
• メガネをする = to wear glasses

The particle を marks the thing being worn.

So ベルトをして is the te-form of ベルトをする.

• ベルトをして = wearing a belt / put on a belt and...

しても here means even if (someone) does or even when (someone) does.

It comes from:

• する → して (te-form)
• しても = even if [one] does it

So:

• ベルトをしても = even if I wear a belt / even with a belt on

The idea is that the belt does not fully solve the problem.

This pattern is very useful:

• 食べても = even if I eat
• 行っても = even if I go
• 見ても = even if I look

So in this sentence, ベルトをしても means something like:

• even if I wear a belt
• even with a belt on

歩きにくい is made from:

• 歩く = to walk
• verb stem 歩き
• にくい = difficult to do

So:

• 歩く → 歩きにくい
• hard to walk
• difficult to walk in

This pattern is very common:

• 読みやすい = easy to read
• 読みにくい = hard to read
• 使いやすい = easy to use
• 使いにくい = hard to use
• 歩きにくい = hard to walk in / hard to walk

In this sentence, it means the pants make walking difficult.

Because 歩きにくい behaves like an い-adjective.

So it can end a sentence by itself in casual style:

• 歩きにくい。 = It’s hard to walk in.

And in polite style:

• 歩きにくいです。

This is the same pattern as:

• 高いです = it’s expensive/high
• 面白いです = it’s interesting
• 歩きにくいです = it’s hard to walk in

So です is just making the sentence polite.

Japanese often leaves out subjects and other obvious information when the context makes them clear.

In English, you might say:

• These pants are a little long, so even if I wear a belt, they’re still hard to walk in.

In Japanese, the I is omitted because it is understood from context.

So the sentence does not explicitly say:

• who is wearing the belt
• who is walking

But the natural interpretation is that the speaker means for me or for the person wearing them.

This kind of omission is extremely common in Japanese.

Here, も adds the meaning of even.

So:

• しても = even if [someone] does
• ベルトをしても = even if I wear a belt

The important nuance is that the expected solution does not help enough.

In other words:

• You might think a belt would fix the problem.
• But even with a belt, walking is still difficult.

So も gives that “even then” feeling.

Here, ズボン refers to one pair of pants.

Japanese nouns usually do not mark singular vs. plural the way English does. So the same noun can often mean one or more depending on context.

In this sentence, この ズボン clearly means:

• this pair of pants
• or these pants in natural English

English uses pants as a plural-looking word, but Japanese ズボン is just a normal noun.

Literally, 歩きにくい is hard to walk.

But in this sentence, natural English is usually:

• hard to walk in
• awkward to walk in

That in comes from the context: we are talking about pants.

So the Japanese does not need a separate word for in here. The listener naturally understands:

• These pants are hard to walk in.

This is a good example of how Japanese often relies on context more than English does.

Yes, から would also work:

• このズボンは少し長いから、ベルトをしても歩きにくいです。

This means basically the same thing.

The difference is mostly nuance:

• ので = a bit softer, more explanatory, often more polite-sounding
• から = more direct, common in casual speech too

So both are grammatical, but ので fits nicely if the speaker is explaining the reason in a gentle way.

No, Japanese is normally written without spaces.

This sentence would usually be written as:

• このズボンは少し長いので、ベルトをしても歩きにくいです。

Spaces are often added in learning materials to make the parts easier to see. They are just for learners.

So the spaced version is helpful for study, but not standard everyday writing.