Tớ sợ trời mưa.

Tớ is an informal way to say I / me.

It is commonly used:

• between friends
• by children or younger people
• in casual, friendly conversation

It sounds more intimate and relaxed than tôi, which is more neutral and polite.

So:

• Tớ sợ trời mưa. = casual, friendly
• Tôi sợ trời mưa. = more neutral / polite

You should not automatically use tớ with strangers, older people, or in formal situations.

Sợ basically means to fear, to be afraid of, or to be scared that.

In this sentence, it can sound like:

• literal fear: I’m afraid of rain / of it raining
• worry or concern: I’m worried it will rain

Vietnamese sợ often covers both ideas, and context tells you which is meant.

Compare:

• Tớ sợ chó. = I’m afraid of dogs.
• Tớ sợ trời mưa. = I’m afraid it will rain / I’m worried it might rain.

Vietnamese often does not have to mark the future explicitly if the meaning is already clear from context.

So Tớ sợ trời mưa can naturally mean:

• I’m afraid it will rain
• I’m worried it may rain

If you want to make the future clearer, you can add sẽ:

• Tớ sợ trời sẽ mưa.

But in everyday speech, this is often unnecessary. Vietnamese frequently leaves tense unstated and lets context do the work.

Yes, trời can mean sky, heaven, or the weather, depending on context.

In weather expressions, trời often works like the subject in English it:

• Trời mưa. = It’s raining.
• Trời nóng. = It’s hot.
• Trời lạnh. = It’s cold.

So in Tớ sợ trời mưa, trời mưa is the clause it rains / it will rain.

Here, mưa is a verb, meaning to rain.

So:

• Trời mưa. = It rains / It’s raining.

But mưa can also be part of noun phrases:

• cơn mưa = a rain shower
• mưa lớn = heavy rain

In Tớ sợ trời mưa, it is clearly verbal.

The structure is:

• Tớ = subject
• sợ = main verb
• trời mưa = clause acting as the thing feared

So literally, it is something like:

• I fear [the sky/weather rains]

More naturally in English:

• I’m afraid it will rain.
• I’m worried it might rain.

Vietnamese often puts a whole clause directly after verbs like sợ, nghĩ, biết, thấy, etc.

Yes. Trời mưa is a complete clause.

• trời = subject
• mưa = verb

So it functions like it rains / it’s raining in English.

That is why Tớ sợ trời mưa is not just a list of words. It is:

• I fear + [it rains / it will rain]

The difference is subtle but important:

• Tớ sợ mưa. = I’m afraid of rain.
  This sounds more general, like rain itself is something I dislike or fear.

• Tớ sợ trời mưa. = I’m afraid it will rain.
  This focuses more on the event of it raining, often in a specific situation.

So if you are about to go out and are worried the weather may turn bad, Tớ sợ trời mưa is very natural.

Yes, absolutely.

• Tớ sợ trời mưa. = casual, friendly
• Tôi sợ trời mưa. = neutral, polite

The grammar stays the same. Only the pronoun changes.

Depending on the relationship, you could also hear:

• Mình sợ trời mưa.
• Em sợ trời mưa.
• Con sợ trời mưa.

Vietnamese pronouns change a lot based on who is speaking and to whom.

No, you do not need là here.

Natural:

• Tớ sợ trời mưa.

Usually less natural or unnecessary:

• Tớ sợ là trời mưa.

After sợ, Vietnamese commonly puts the clause directly after it.

So just remember:

• sợ + noun
• sợ + clause

Examples:

• Tớ sợ rắn. = I’m afraid of snakes.
• Tớ sợ cậu không đến. = I’m afraid you won’t come.
• Tớ sợ trời mưa. = I’m afraid it will rain.

A rough pronunciation guide is:

• Tớ ≈ tuh with a broken, dipping tone
• sợ ≈ something like suh with a heavy falling tone
• trời ≈ roughly chuh-ee / juh-ee depending on accent
• mưa ≈ roughly moo-uh

A very rough English-style approximation:

• Tớ sợ trời mưa ≈ tuh suh chuh-ee moo-uh

But the tones matter a lot, especially in:

• tớ
• sợ
• trời

So it is best to learn this with audio rather than relying only on English approximations.

Not usually.

In English, I’m afraid... can be a polite discourse phrase, as in:

• I’m afraid we’re late.
• I’m afraid I can’t help.

Vietnamese sợ is usually more literal: fear, be afraid, or worry.

So Tớ sợ trời mưa normally means real concern about rain, not just a polite conversational phrase.

You put không before sợ:

• Tớ không sợ trời mưa. = I’m not afraid it will rain. / I’m not worried about it raining.

This is the normal position for negation:

• subject + không + verb

So:

• Tớ sợ trời mưa.
• Tớ không sợ trời mưa.