watasitati ha zinkoukokyuu wo rensyuusuru.

It is read:

わたしたち は じんこうこきゅう を れんしゅうする。

Without the learner spaces, it would normally be written:

私たちは人工呼吸を練習する。

When は is used as the topic particle, it is pronounced わ.

So in 私たちは, the は is not read ha. It is read wa because it marks the topic of the sentence.

This is one of the first big pronunciation exceptions learners meet in Japanese.

は marks the topic of the sentence.

So 私たちは means something like:

• as for us
• we

In natural English, you usually just say we, but in Japanese the idea is slightly different: は sets up what the sentence is going to talk about.

を marks the direct object of the verb.

Here, 人工呼吸を練習する means that artificial respiration / rescue breathing is the thing being practiced.

So:

• 人工呼吸 = the thing
• を = marks it as the object
• 練習する = to practice

Japanese normally places the verb at the end.

A very common basic pattern is:

topic + object + verb

So this sentence follows a normal Japanese word order:

• 私たちは = as for us
• 人工呼吸を = artificial respiration
• 練習する = practice

English and Japanese often organize sentences differently, so this is something learners get used to over time.

It is the plain non-past form.

That means it can mean:

• practice
• will practice
• do practice

depending on context.

Japanese does not usually separate present and future the way English does. So 練習する could describe a general action, a habitual action, or a future action.

練習 by itself is a noun meaning practice.

To say to practice, Japanese often adds する to a noun. This creates a verb-like expression:

• 練習 = practice
• 練習する = to practice

This is very common in Japanese. Many nouns can combine with する to make verbs.

Yes. 練習する and 練習をする are both possible.

So these are both grammatical:

• 人工呼吸を練習する
• 人工呼吸の練習をする

You may also hear:

• 人工呼吸を練習する = practice artificial respiration
• 人工呼吸の練習をする = do practice of artificial respiration

The second version is a little more explicit because it uses の to connect the nouns.

It could definitely be omitted if the context already makes it clear who is doing the action.

Japanese often leaves out subjects and topics when they are understood.

So in context, you might simply say:

人工呼吸を練習する。

That can still naturally mean We practice artificial respiration or We will practice artificial respiration, depending on the situation.

練習する is the plain form.

A more polite version would be:

私たちは人工呼吸を練習します。

So:

• 練習する = plain
• 練習します = polite

The plain form is not automatically rude. It is just less formal, and it is the dictionary form you usually learn first.

Yes, but the nuance changes.

• 私たちは人工呼吸を練習する。 = As for us, we practice / will practice artificial respiration.
• 私たちが人工呼吸を練習する。 = We are the ones who practice / will practice artificial respiration.

Using が puts more focus on we as the subject, often with a sense of identification or contrast.

So は is the more neutral choice here if you are just stating what we do.

No. In normal Japanese writing, this sentence would usually be written without spaces:

私たちは人工呼吸を練習する。

Textbooks often add spaces for beginners to make the sentence structure easier to see.

人工呼吸 literally means artificial respiration.

In many contexts, it refers to rescue breathing. Depending on the lesson, it may be part of a broader first-aid or CPR context.

So if you were thinking of full CPR, note that 人工呼吸 specifically points to the breathing part, not necessarily the entire CPR procedure.