Learn Hardcore Japanese: watasi ha tomodati ni ryokoukeikaku wo misemasu.

In this sentence は is the topic marker. It tells the listener that “私” (I) is what we’re talking about. It doesn’t mark the subject directly; it sets “I” as the theme of the sentence. In English you might think of it as “As for me, …”.

Why is 友達 followed by に instead of another particle?

The particle に marks the indirect object or the recipient of an action. Here “友達に” means “to (my) friend.” You use に whenever you show something or give something to someone.

What role does を play after 旅行計画?

The particle を marks the direct object of the verb. In “旅行計画を見せます,” 旅行計画 (travel plan) is the thing being shown, so it takes を.

What’s the difference between 見せる and 見る?

Although they look similar, they mean different things:
• 見る (miru) means “to see” or “to look at.”
• 見せる (miseru) means “to show” something to someone.
In our sentence we’re doing the showing, not just looking.

How do you change 見せます to plain form or past tense?

• Polite present: 見せます
• Plain present: 見せる
• Polite past: 見せました
• Plain past: 見せた

To form the plain present, replace 〜ます with 〜る. To get the polite past, change 〜ます to 〜ました.

Can you drop 私 in this sentence? When do you omit pronouns?

Yes. In Japanese, if context makes it clear who the topic is, you can omit 私 altogether:
友達に旅行計画を見せます。
Pronouns are often dropped when they’re understood from context or previous conversation.

Why does the verb come at the end of the sentence?

Japanese is an SOV (Subject–Object–Verb) language, so the verb typically appears at the end. You first present the topic (私), then any indirect object (友達に), the direct object (旅行計画を), and finally the verb (見せます).

What’s the reading and meaning of the compound 旅行計画?

• 旅行 (りょこう, ryokō) means “travel” or “trip.”
• 計画 (けいかく, keikaku) means “plan” or “planning.”
Together 旅行計画 (りょこうけいかく) means “travel plan.”