asa ha taionkei de taion wo hakarimasu.

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.

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.

They refer to two different things:

• 体温計 = thermometer
• 体温 = body temperature

So the structure is:

• 体温計で = using a thermometer
• 体温を = body temperature as the thing being measured

In English, this is like saying:

• I measure my body temperature with a thermometer.

Even though the words are related, they have different jobs in the sentence.

を marks the direct object of the verb, meaning the thing directly affected by the action.

Here, the verb is 測ります = measure, and the thing being measured is 体温.

So:

• 体温を測ります = measure body temperature

This is the standard pattern:

• Noun + を + Verb

Examples:

• 長さを測ります。 = measure length
• 時間を測ります。 = measure time

測ります is the polite -ます form of 測る（はかる）, which means to measure.

Japanese has several verbs pronounced はかる, but they use different kanji depending on meaning. 測る is used for measuring things like:

• temperature
• length
• depth
• time

So 体温を測る is the natural expression for measure body temperature.

A learner may notice other はかる verbs, such as:

• 計る
• 図る
• 量る

These are different words in writing, even if the pronunciation is the same. For body temperature, 測る is the normal choice.

It can mean either, depending on context.

Japanese non-past forms often cover both present and future. In this sentence, because 朝は suggests a routine, 測ります is usually understood as:

• I measure my temperature in the morning
• I take my temperature every morning

So it often has a habitual meaning here, not just a one-time future action.

The subject is omitted because Japanese often leaves out information that is understood from context.

So 朝は体温計で体温を測ります。 could mean:

• I measure my temperature in the morning.
• We measure body temperature in the morning.
• They measure body temperature in the morning.

In many beginner examples, it is often understood as I unless context says otherwise.

This is very normal in Japanese. If the subject is clear, it is often not stated.

Usually, yes.

Because the sentence starts with 朝は, it often sounds like a general routine or customary action:

• In the morning, I measure my temperature.
• Every morning, I take my temperature.

Japanese often does not need words like every if the context already makes the meaning clear.

If someone wanted to make every morning more explicit, they could say:

• 毎朝、体温計で体温を測ります。

Yes, Japanese word order is more flexible than English, as long as the particles stay correct.

The original sentence is:

• 朝は 体温計で 体温を 測ります。

You might also see:

• 朝は体温を体温計で測ります。

Both are understandable because:

• は marks the topic
• で marks the instrument
• を marks the object

That said, some orders sound more natural than others depending on emphasis. The original sentence is clear and natural.

It is read:

• あさ は たいおんけい で たいおん を はかります。

Word by word:

• 朝 = あさ
• は = written は, pronounced わ here because it is the topic particle
• 体温計 = たいおんけい
• で = で
• 体温 = たいおん
• を = written を, usually pronounced お
• 測ります = はかります

A useful point for learners:

• particle は is pronounced わ
• particle を is usually pronounced お

Yes. In natural English, take my temperature is often the best translation.

Literally, the Japanese is closer to:

• measure body temperature with a thermometer

But natural English often says:

• take my temperature
• check my temperature

So if the meaning has already been shown, it is good to know that the Japanese wording is perfectly normal even if the most natural English translation does not match word-for-word.