Question 1

How do you read 地球 and 環境, and what do these kanji mean?

Accepted Answer

地球 is read ちきゅう (地 = earth/ground, 球 = sphere/ball), literally “the earth.”  
環境 is read かんきょう (環 = ring/circle, 境 = boundary/condition), meaning “environment.”

Question 2

What does ために mean in this sentence, and how is it used to express purpose?

Accepted Answer

When ために follows a verb in its dictionary form, it means “in order to ….”  
Here, 地球を守るために means “in order to protect the Earth.”  
Grammar pattern: Verb (dictionary form) + ために = purpose clause.

Question 3

Why is 守る in plain form rather than the polite 守ります in the purpose clause?

Accepted Answer

Subordinate clauses (like those with ために) always use the dictionary/plain form of the verb, regardless of whether the main clause is polite. That’s why it’s 守るために, even though we end with the polite 選びます.

Question 4

What is the role of を after 地球?

Accepted Answer

を marks the direct object of a transitive verb. In 地球を守る, 地球 is the thing being “protected,” so it takes を before the verb 守る.

Question 5

Why is there a comma after ために?

Accepted Answer

Japanese often uses commas to separate clauses for readability. Here, the comma shows that 地球を守るために is a standalone purpose clause before the main action 環境にいい商品を選びます. It’s optional but common in writing.

Question 6

What does 環境にいい mean, and why is the particle に used with 環境?

Accepted Answer

環境にいい means “good for the environment.” The particle に marks the target or beneficiary of いい (“good”). So you’re saying the product is beneficial to (for) the 環境.

Question 7

Could I say 環境がいい instead of 環境にいい?

Accepted Answer

No. 環境がいい means “the environment is good/nice.”  
To describe something as “good for the environment,” you need ～にいい (beneficial to X).

Question 8

Why is the main verb 選びます in the polite form?

Accepted Answer

The speaker is making a polite statement about their action. In Japanese it’s common to use ～ます-form for the main verb when speaking or writing politely.

Question 9

Are there other ways to say “eco-friendly products” besides 環境にいい商品?

Accepted Answer

Yes. For example:  
• エコ商品 (“eco products”)  
• 環境にやさしい商品 (“products that are gentle/kind to the environment”)

tikyuu wo mamoru tame ni, kankyou ni ii syouhin wo erabimasu.

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