yīshēng jiù le tā.

Here, 了 marks the action as completed. It shows that the saving happened and was carried through.

So 医生救了他 means something like:

• The doctor saved him
• The doctor rescued him

A very important point: 了 does not simply mean past tense by itself. It is mainly about aspect—whether the action is viewed as completed.

This sentence follows the basic Mandarin pattern:

Subject + Verb + Object

So:

• 医生 = the doctor / a doctor
• 救了 = saved
• 他 = him

That is very similar to English:

• The doctor saved him

So in this sentence, the word order is quite straightforward for an English speaker.

Mandarin usually does not use articles like a, an, or the.

So 医生 can mean:

• a doctor
• the doctor
• sometimes just doctor(s) depending on context

You figure out which one is meant from the situation, not from a separate word. In this sentence, 医生救了他 could mean either A doctor saved him or The doctor saved him, depending on context.

Yes. In Mandarin, 他 can mean both he and him.

Unlike English, Mandarin pronouns do not change form for subject and object the way he/him does.

For example:

• 他来了。 = He came.
• 我看见他。 = I saw him.

In your sentence, 他 is after the verb, so it is the object: him.

It can mean both, depending on context.

救 often means:

• to save
• to rescue

So 医生救了他 could be understood as:

• The doctor saved him
• The doctor rescued him

If the context is medical, English usually prefers saved him. If the context is danger or emergency, rescued him may also fit.

Yes, you can, but the meaning changes.

• 医生救了他 = the doctor saved him / did save him
• 医生救他 = the doctor saves him, is saving him, or just save him in a more general or context-dependent sense

Without 了, the sentence does not clearly present the action as completed. Mandarin often leaves time reference to context, so 了 helps show that the saving actually happened and was completed.

Not exactly.

English uses tense very heavily, but Mandarin does not work the same way. 了 is not just a past marker. It is better understood as a completion marker.

For example, a sentence with 了 is often translated into English past tense, but the real idea is:

• the action is finished
• the situation has changed

So while 救了 often becomes saved in English, 了 is not a direct equivalent of -ed.

Usually you would say:

医生没救他。

Here 没 (méi) is used to negate a completed action.

A key rule is:

• 没 + verb for something that did not happen
• not usually 不 + 了 for this meaning

So:

• 医生救了他。 = The doctor saved him.
• 医生没救他。 = The doctor did not save him.

不救 usually means won’t save, doesn’t save, or refuses to save, not simply didn’t save.

Not normally.

救 specifically has the idea of saving or rescuing, often from danger, death, or serious harm.

If you want to say treat, you would usually use a different verb, such as:

• 治疗 (zhìliáo) = to treat medically

So:

• 医生救了他 = The doctor saved him.
• 医生治疗了他 = The doctor treated him.

Because 医生 is being used directly as the subject.

In Mandarin, you do not need a measure word before a noun unless the grammar requires one, such as when you are saying one doctor, that doctor, this doctor, etc.

Compare:

• 医生救了他。 = A/The doctor saved him.
• 一个医生救了他。 = One doctor / A doctor saved him.
• 那个医生救了他。 = That doctor saved him.

So the plain noun 医生 is perfectly natural here.

医生 is pronounced yīshēng:

• yī = first tone
• shēng = first tone

So both syllables are high and level.

A rough guide:

• yī sounds a bit like yee
• shēng sounds somewhat like shung or sheng, but with Mandarin sh

Also, the r-like sound in English is not used here. Keep it clean and light: yī-shēng.

It is grammatical and natural, but a little bare by itself, so it can feel textbook-like without context.

In real life, people often add context, such as:

• 医生救了他一命。 = The doctor saved his life.
• 是那个医生救了他。 = It was that doctor who saved him.
• 医生终于救了他。 = The doctor finally saved him.

But 医生救了他。 is still a perfectly correct sentence.

In speech, yes, it can sound the same.

Mandarin has different written characters for:

• 他 = he/him
• 她 = she/her

But both are pronounced tā in standard spoken Mandarin.

So if you only hear the sentence, you would need context to know whether the person is male or female. In writing, this sentence specifically uses 他, so it means him.