kihonryoukin ha takai.

It is pronounced:

きほんりょうきん は たかい。
Romanized: kihon ryōkin wa takai

A few notes:

• 基本料金 = きほんりょうきん
• The particle は is written ha but pronounced wa when it marks the topic.
• 高い = たかい

基本料金 is a noun phrase.

It is made of:

• 基本 = basic / standard / fundamental
• 料金 = fee / charge / rate

Together, 基本料金 means something like basic fee, base charge, or standard rate.

In the sentence, it is the topic of the statement because it is followed by は.

は marks the topic, while が often marks the subject or emphasizes what specifically has the property.

So:

• 基本料金は高い。 = As for the basic fee, it is high.
• 基本料金が高い。 = The basic fee is high / It is the basic fee that is high

In many situations, both can be translated similarly into English, but the nuance is different.

With は, the speaker may be:

• introducing 基本料金 as the thing being talked about
• contrasting it with something else, such as usage fees or option fees

Example nuance:

• 基本料金は高いが、通話料は安い。
  The basic fee is high, but the call charges are cheap.

Japanese basic word order is often described as topic/comment or subject/object/verb, and the main descriptive element often comes at the end.

Here:

• 基本料金は = as for the basic fee
• 高い = is high

So the sentence ends with the main predicate, 高い.

That is normal in Japanese.

高い is an い-adjective.

That means it behaves differently from nouns and な-adjectives.

Examples:

• 高い。 = is expensive / is high
• 高くない。 = is not expensive / is not high
• 高かった。 = was expensive / was high
• 高くなかった。 = was not expensive / was not high

In this sentence, 高い is the predicate by itself, so you do not need a verb like to be.

It can mean either in general, but with 料金 or money-related words, it usually means expensive.

So in this sentence, 高い is naturally understood as:

• expensive
• costly
• high in price

Japanese uses the same adjective for both physical height and high cost, and context tells you which meaning is intended.

基本料金は高い。 is in the plain form.

You can make it more polite by saying:

基本料金は高いです。

Both are correct. The difference is politeness:

• 高い。 = plain / casual / neutral written style
• 高いです。 = polite

Plain form is common in:

• casual conversation
• dictionary-style examples
• written explanations
• informal writing

Yes. Japanese often does not use a separate word corresponding to English it is in this kind of sentence.

The structure is complete as:

• 基本料金は = as for the basic fee
• 高い = is high / expensive

So 高い itself functions as the predicate, and the sentence is fully grammatical.

Japanese normally does not use spaces between words.

So it would usually be written as:

基本料金は高い。

Spaces are often added in learning materials to make the structure easier to see.

Yes, you can.

基本料金が高いです。 is grammatical and polite.

The difference from 基本料金は高いです。 is nuance:

• は: presents basic fee as the topic
• が: highlights basic fee as the thing that is high

A learner-friendly way to think about it:

• は = speaking of...
• が = the one that...

In many everyday contexts, both are possible, but は is very common when simply making a general statement.

It is safer to say that 基本料金 is the topic in this sentence because it is marked by は.

In beginner explanations, people sometimes loosely call it the subject, but grammatically は marks the topic.

So:

• 基本料金は = topic
• 高い = predicate

This distinction matters because Japanese often talks about a topic rather than building sentences exactly the way English does.

Yes. は often carries a slight contrastive feeling, depending on context.

For example, 基本料金は高い。 might suggest something like:

• the basic fee is high, though maybe other parts are not
• at least the basic fee is high
• compared with something else, the basic fee is high

Sometimes that contrast is strong, and sometimes it is barely noticeable. Context decides how much contrast the listener feels.

Here is the breakdown:

• 基 = き
• 本 = ほん
• 料 = りょう
• 金 = きん

So:

• 基本 = きほん
• 料金 = りょうきん
• 基本料金 = きほんりょうきん

This is useful because 料金 is a very common word in Japanese for fees and charges.