wǒ xiǎng juānzèng zhèxiē jiùwù.

Here 想 means would like to / want to.

In Mandarin, 想 can mean different things depending on context:

• 想 + verb = want to do something
  • 我想捐赠这些旧物。 = I want to donate these old items.
• 想 + clause / idea can mean think
  • 我想他不会来。 = I think he won’t come.
• 想 + person/thing can also mean miss
  • 我想你。 = I miss you.

So in this sentence, because 想 is followed by the verb 捐赠, the meaning is want to donate.

Both can express wanting, but the tone is different.

• 想 = softer, more like would like to, am thinking of
• 要 = stronger, more direct, more like want or intend to

So:

• 我想捐赠这些旧物。
  = I’d like to donate these old items.
• 我要捐赠这些旧物。
  = I’m going to donate these old items / I definitely want to donate them.

For a simple statement of intention, 想 sounds gentle and natural.

捐赠 means to donate, usually in a somewhat formal or written style.

It is often used for donating:

• money
• books
• clothes
• supplies
• goods

It can sound more formal than everyday spoken alternatives.

Common related words:

• 捐 = donate
• 捐出 = donate out / give away as a donation
• 捐给 = donate to
• 捐赠 = donate (formal)

In casual spoken Mandarin, people often say things like:

• 我想把这些旧东西捐出去。
• 我想把这些衣服捐掉。

So your sentence is correct, but it sounds a bit more formal than everyday conversation.

No measure word is missing.

这些 means these.
The 些 already works like a plural/collective marker, so you do not need another classifier after it.

Compare:

• 这本书 = this book
• 这些书 = these books

You do not say 这些本书.

So in 这些旧物, 这些 already means these (multiple).

旧物 literally means old things or used items.

It is understandable, but it can sound a little literary, formal, or category-like depending on context. It is not always the most natural everyday spoken choice.

More conversational alternatives are:

• 旧东西 = old things
• 旧衣物 = old clothes/items of clothing
• 二手物品 = second-hand items
• 不用的东西 = things you don’t use anymore

So:

• 我想捐赠这些旧物。 = correct
• In conversation, many speakers might more naturally say:
  • 我想捐掉这些旧东西。

Mandarin word order here is very straightforward:

• 我 = subject
• 想 = modal/auxiliary verb expressing desire
• 捐赠 = main verb
• 这些旧物 = object

So the pattern is:

Subject + 想 + Verb + Object

That is why:

• 我想捐赠这些旧物。

and not something like:

• 我想这些旧物捐赠。 ❌

Mandarin usually keeps the verb before its object, just like English does in this kind of sentence.

A 把 sentence is possible, but it is not required.

Your sentence is a normal Verb + Object structure:

• 我想捐赠这些旧物。

If you want to emphasize what is being dealt with, you can use 把:

• 我想把这些旧物捐赠出去。
• 我想把这些旧物捐给慈善机构。

Using 把 often sounds more action-focused, especially when there is a result or direction like:

• 捐出去 = donate away
• 捐给… = donate to ...

Without 把, the sentence is simpler and perfectly correct.

Yes. You can add the recipient after the verb, often with 给.

For example:

• 我想捐赠这些旧物给慈善机构。
• 我想把这些旧物捐赠给慈善机构。

The second version with 把 is often smoother and more natural.

Examples:

• 我想把这些旧物捐给学校。 = I want to donate these old items to a school.
• 我想把这些旧物捐给慈善机构。 = I want to donate these old items to a charity.

Because this sentence talks about an intention, not a completed action.

• 我想捐赠这些旧物。
  = I want to donate these old items.
  (just intention)

If you add 了, the meaning changes depending on context, and it may sound like a new decision or a changed situation rather than a plain intention.

For a simple statement of what you want to do, no 了 is needed.

If the donation is completed, you would usually say something different, for example:

• 我已经捐赠了这些旧物。 = I have already donated these old items.

Yes, there is a tone change in natural speech.

Individually:

• 我 = wǒ (3rd tone)
• 想 = xiǎng (3rd tone)

When two 3rd tones come together, the first one usually changes to a rising 2nd-tone-like sound. So 我想 is commonly pronounced more like:

• wó xiǎng

This is called third-tone sandhi.

The other words are:

• 捐赠 = juānzèng
• 这些 = zhèxiē
• 旧物 = jiùwù

So the whole sentence is pronounced approximately:

• wó xiǎng juānzèng zhèxiē jiùwù

Yes, it is correct and understandable, but it sounds a bit formal.

A native speaker might say this in writing, in a public message, or in a slightly formal conversation.

More casual spoken alternatives include:

• 我想捐掉这些旧东西。
• 我想把这些旧东西捐出去。
• 我想把这些旧衣物捐了。

So:

• 我想捐赠这些旧物。 = correct, a bit formal
• 我想捐掉这些旧东西。 = more everyday spoken Mandarin

Yes. 捐赠 is not limited to old items. It can be used for many kinds of donations, especially in formal language.

Common examples:

• 捐赠衣物 = donate clothing
• 捐赠图书 = donate books
• 捐赠资金 = donate funds
• 捐赠物资 = donate supplies

So 捐赠 is a general verb for donating, and 这些旧物 is just the specific thing being donated in this sentence.