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要不是 means if it were not for... or were it not that....

In this sentence, it introduces the reason that prevents a negative outcome:

• 要不是合同写得很清楚，我还真不放心马上把押金给她。
• If the contract weren’t written so clearly, I really wouldn’t feel comfortable giving her the deposit right away.

It is similar to 如果不是, but 要不是 is often more natural in spoken Mandarin and usually carries a stronger counterfactual feeling:

• 要不是你帮我，我就完了。 = If it weren’t for your help, I’d be done for.

So here, the idea is:

• because the contract is clearly written, the speaker feels okay enough;
• otherwise, they would not feel at ease.

Because 写得很清楚 uses the verb + 得 + complement pattern.

Structure:

• 写 = write
• 得 = links the verb to a description of how well / to what degree something is done
• 很清楚 = very clearly

So:

• 写得很清楚 = written very clearly / written in a very clear way

You usually need 得 when describing how an action is performed.

Compare:

• 他说得很快。 = He speaks very fast.
• 字写得很好。 = The characters are written very well.

So 合同写得很清楚 literally means something like:

• the contract is written clearly

Without 得, 写很清楚 would sound ungrammatical in this structure.

In Chinese, the thing being described can appear first even when the person doing the action is not mentioned.

So:

• 合同写得很清楚

means:

• The contract is written very clearly.

The writer is unspecified. Chinese does this very naturally when the focus is on the resulting state or quality, not on the agent.

In English, we might think in passive terms:

• The contract was written clearly.

But Chinese does not need a passive marker like 被 here, because the sentence is simply describing the contract’s quality.

Using 被 would shift the focus more toward the action being done to it, and would sound less natural here.

还真 adds emphasis and a slightly conversational tone. It often means something like:

• really
• actually
• genuinely

So:

• 真不放心 = really not feel at ease
• 还真不放心 = really honestly wouldn’t feel at ease / actually really wouldn’t feel okay with it

The 还 here does not mean still. It works as an intensifier, making the feeling sound more genuine or stronger.

So 我还真不放心 sounds a bit like:

• I really honestly wouldn’t feel comfortable
• I truly wouldn’t be okay with that

It is a very natural spoken-style emphasis.

放心 literally means set one’s heart at ease, and in natural English it often means:

• feel at ease
• feel reassured
• not worry
• feel comfortable with something

So:

• 我不放心 = I’m not at ease / I’m worried / I don’t feel comfortable with it

In this sentence:

• 我还真不放心马上把押金给她

means the speaker would not feel comfortable immediately handing over the deposit.

A useful pattern is:

• 放心 + 做某事
• feel at ease doing something

or more commonly in the negative:

• 不放心 + 做某事
• not feel comfortable doing something

Example:

• 我不放心一个人去。 = I’m not comfortable going alone.

Because 放心 is being treated as a state/feeling, and 不 is normally used to negate states, habits, intentions, and general judgments.

So:

• 不放心 = not feel at ease / not be comfortable with it

没 is usually used for:

• things that didn’t happen
• completed actions in the past
• have not type meanings

For example:

• 我没给她押金。 = I didn’t give her the deposit.
• 我不放心给她押金。 = I’m not comfortable giving her the deposit.

So in this sentence, the point is not that the speaker failed to become reassured as a completed event; it is that they would not feel reassured. That is why 不 is right.

Because 马上 is an adverb, and Chinese adverbs usually go before the verb phrase they modify.

Here it modifies the action:

• 把押金给她
• give the deposit to her

So:

• 马上把押金给她
• give her the deposit right away / immediately

This word order is very normal in Mandarin:

• 我马上去。 = I’ll go right away.
• 他马上告诉我。 = He told me immediately / He’ll tell me right away.
• 我不放心马上把押金给她。 = I wouldn’t feel comfortable immediately giving her the deposit.

So 马上 comes before the action it describes.

This is a 把-construction, which puts focus on what happens to a specific object.

Structure:

• 把 + object + verb + other elements

Here:

• 把押金给她
• literally: take the deposit and give it to her

The object 押金 is brought forward because it is the thing being handled or disposed of.

This is natural when:

• the object is specific and known
• the action clearly affects or moves that object

Compare:

• 我马上给她押金。 = I immediately give her the deposit.
  This is possible in some contexts, but less natural here.

• 我马上把押金给她。 = I immediately hand the deposit over to her.
  This sounds more focused and complete.

So 把 highlights the concrete act of handing over the deposit.

Here, 给 is functioning as the main verb meaning to give.

So:

• 把押金给她 = give the deposit to her

Breakdown:

• 把押金 = take the deposit as the object under discussion
• 给 = give
• 她 = her

This is different from cases where 给 acts more like for or to in a prepositional sense.

For example:

• 我给她买了一本书。 = I bought a book for her.
  Here 给她 works more like a prepositional phrase.

But in:

• 我把书给她。 = I gave her the book.
  Here 给 is the main verb.

So in your sentence, it is best understood as give.

Not necessarily. It mainly expresses the speaker’s attitude or willingness.

The sentence says that because the contract is clearly written, the speaker would feel okay about giving her the deposit right away. Without that, they would not.

So it suggests:

• the speaker is now willing, or
• the speaker feels reassured enough to do it

But it does not automatically confirm that the deposit has already been given.

If the speaker wanted to make it clear that they already did it, they might say something more explicit, such as:

• 要不是合同写得很清楚，我还真不放心马上把押金给她了。
• or
• ……我才敢马上把押金给她。

Your original sentence focuses more on confidence / comfort level, not necessarily the completed action.

Not exactly. This is a very common point of confusion.

• 押金 = security deposit
• 定金 = earnest money / down payment used to secure a deal

A simple way to think about it:

• 押金 is usually money held as a guarantee and may be returned later
• 定金 is usually money paid to lock something in, and legal/business consequences may be different

Examples:

• renting an apartment: usually 押金
• booking or reserving something with a commitment payment: often 定金

So in this sentence, 押金 suggests the speaker is giving a deposit as security, not just making an advance purchase payment.

Yes. A few alternatives are possible, but they are not exactly identical in tone.

1. 如果不是合同写得很清楚，我还真不放心马上把押金给她。
   This is grammatical and means almost the same thing. It sounds a bit more neutral or textbook-like than 要不是.

2. 要不是合同写得很清楚，我还真不敢马上把押金给她。
   This changes the nuance:

   • 不放心 = not feel at ease
   • 不敢 = not dare

So 不敢 sounds stronger.

3. 合同要不是写得很清楚，我还真不放心马上把押金给她。
   Also possible, though the original version is more straightforward.

So the original sentence is natural and idiomatic, especially in spoken Mandarin:

• 要不是...，我还真不放心...