toukyuufoomu wo kakuninsuru.

It is read:

とうきゅうフォーム を かくにんする
Romanized: tōkyū fōmu o kakunin suru

A few notes:

• 投球 = とうきゅう
• フォーム = fōmu
• を is written を but pronounced like o
• 確認する = かくにんする

投球フォーム means pitching form or throwing form, especially in a baseball context.

It is made of:

• 投球 = pitching / throwing a ball
• フォーム = form, posture, technique, body mechanics

So this noun phrase refers to the way someone throws the ball.

フォーム is a loanword, borrowed from English form, so it is written in katakana.

This is very common in Japanese:

• native/Japanese-origin words may use kanji or hiragana
• foreign loanwords are often written in katakana

In sports, Japanese often uses katakana words like:

• フォーム = form
• ボール = ball
• スイング = swing

を marks the direct object of the verb.

Here:

• 投球フォーム = the thing being checked
• 確認する = to check / confirm

So 投球フォームを確認する literally means to check the pitching form.

A simple structure is:

noun + を + verb

So:

• 投球フォーム = object
• を = object marker
• 確認する = verb

確認 by itself is a noun meaning confirmation or checking.

To turn it into a verb, Japanese adds する:

• 確認 = confirmation/check
• 確認する = to confirm / to check

This is a very common pattern in Japanese, especially with Sino-Japanese words:

• 勉強 → 勉強する
• 練習 → 練習する
• 確認 → 確認する

確認する often has the nuance of checking carefully, verifying, or making sure.

Depending on context, it can mean:

• check
• confirm
• verify

So in this sentence, it may suggest more than just a quick glance. It can imply:

• looking at the pitching form to make sure it is correct
• reviewing it carefully
• verifying the details of the motion

In sports or instruction contexts, 確認する is very natural.

Japanese normally places the main verb at the end of the sentence.

So the basic order here is:

投球フォーム + を + 確認する
pitching form + object marker + check

This is different from English, where we usually say:

• check the pitching form

Japanese often follows a subject/object + verb pattern.

Yes, it can be.

Japanese often omits the subject when it is obvious from context. So this could mean:

• I check the pitching form
• We check the pitching form
• Check the pitching form
• To check the pitching form

The exact interpretation depends on context.

Also, in textbooks, instructions, labels, and training materials, dictionary-form phrases like this often function as:

• a plain statement
• a heading
• a task description
• an action item

So it is very natural even without a stated subject.

確認する is the plain/dictionary form.
確認します is the polite form.

So:

• 確認する = plain
• 確認します = polite

The plain form is often used in:

• dictionary entries
• captions
• notes
• training instructions
• casual writing

If you were speaking politely, you might say:

• 投球フォームを確認します。

But in a manual, memo, or list of actions, 確認する is very common.

It is a noun phrase made from two parts:

• 投球
• フォーム

Together they act as one unit meaning pitching form.

Japanese often combines nouns like this:

• 野球選手 = baseball player
• 練習方法 = practice method
• 投球フォーム = pitching form

So grammatically, the whole phrase works as the object of 確認する.

Yes, if the context is already clear.

• 投球フォームを確認する is more specific: check the pitching form
• フォームを確認する is less specific: check the form

If you are already talking about baseball pitching, フォーム alone may be enough. But without context, フォーム could mean many kinds of form, such as:

• pitching form
• batting form
• running form
• posture

So 投球 makes it clear exactly what kind of form is being checked.

Usually, 投球 strongly suggests pitching a ball, especially in baseball.

It literally relates to throwing a ball, but in many real contexts it is most naturally understood as pitching. That is why 投球フォーム sounds very natural in baseball or sports instruction.

It is very natural, especially in contexts like:

• sports coaching
• training instructions
• checklists
• captions
• study materials

It sounds a bit like a task or action item:

• Check the pitching form
• Review the pitching form

If you wanted a more conversational sentence, you might add context, such as:

• 投球フォームを確認します。
• まず、投球フォームを確認する。
• コーチが投球フォームを確認する。

But as written, it is perfectly natural.