asa wa taionkei de taion o hakarimasu.

In the morning, I take my temperature with a thermometer.

Breakdown of asa wa taionkei de taion o hakarimasu.

• は: topic particle
• を: direct object particle
• 朝あさ: morning
• で: means particle

Questions & Answers about asa wa taionkei de taion o hakarimasu.

Why is は used after 朝?

は marks 朝 as the topic: As for the morning, ... or more naturally In the morning, ...

In this sentence, 朝は sets the time frame for what usually happens. It often has a nuance like in the morning or as for mornings.

A learner might expect 朝に, and that is possible in some contexts, but 朝は is very common when the speaker is talking about a routine or contrasting morning with other times.

• 朝は体温を測ります。 = In the morning, I measure my temperature.
• This can imply a habit or general practice.

Why is で used after 体温計?

で here marks the tool or means used to do the action.

So:

• 体温計で = with a thermometer
• 体温を測ります = measure body temperature

This is a very common use of で:

• 箸で食べます。 = eat with chopsticks
• ペンで書きます。 = write with a pen

So 体温計で tells you what instrument is used for measuring.

Why are both 体温計 and 体温 in the sentence? They both seem related to temperature.