Tớ đồng ý hủy kế hoạch.

Tớ is an informal first-person pronoun meaning I / me, usually used with friends, classmates, or people of similar age.

So Tớ đồng ý hủy kế hoạch sounds casual and natural in everyday conversation.

Common alternatives:

• Tôi đồng ý hủy kế hoạch. = more neutral / formal
• Mình đồng ý hủy kế hoạch. = friendly, soft, common in some contexts

A native speaker chooses the pronoun based on relationship and tone, not just grammar.

Đồng ý means to agree.

In this sentence:

• Tớ = I
• đồng ý = agree
• hủy kế hoạch = cancel the plan

So the structure is basically:

• I agree [to cancel the plan].

You can also use đồng ý in other patterns:

• Tôi đồng ý. = I agree.
• Tôi đồng ý với bạn. = I agree with you.
• Tôi đồng ý đi. = I agree to go.

Vietnamese does not need an extra word like English to in this kind of structure.

English says:

• I agree to cancel the plan.

Vietnamese says:

• Tớ đồng ý hủy kế hoạch.

After đồng ý, a verb can come directly:

• đồng ý đi = agree to go
• đồng ý làm = agree to do
• đồng ý hủy = agree to cancel

So this is normal Vietnamese grammar.

Yes. Hủy is a very common and standard word for cancel.

Examples:

• hủy cuộc họp = cancel the meeting
• hủy vé = cancel the ticket / booking
• hủy đơn hàng = cancel the order
• hủy kế hoạch = cancel the plan

It is a fairly neutral word and works in both everyday and formal situations.

Vietnamese word order here is very straightforward:

• hủy = cancel
• kế hoạch = the plan

So hủy kế hoạch literally means cancel plan.

Vietnamese usually places the verb before its object:

• ăn cơm = eat rice
• mua sách = buy books
• hủy kế hoạch = cancel the plan

This is similar to normal English verb-object order.

It can mean either plan or the plan, depending on context.

Vietnamese often does not require articles like a or the. The listener understands from the situation.

So:

• hủy kế hoạch could mean cancel a plan
• or cancel the plan

If you want to make it more specific, you can add words such as:

• kế hoạch đó = that plan
• kế hoạch này = this plan
• một kế hoạch = a plan / one plan

Yes, in natural English that is a reasonable way to understand it.

The Vietnamese sentence most directly means:

• I agree to cancel the plan or
• I agree that we should cancel the plan

It does not necessarily focus on who will do the canceling. It mainly expresses agreement with the action of canceling the plan.

Yes, very often, if the subject is already clear from context.

For example:

• Đồng ý hủy kế hoạch. = Agree to cancel the plan. / I agree to cancel the plan.

Vietnamese frequently drops subjects when they are obvious. But if you want to be clear, especially for learners, keeping tớ is helpful.

Both are possible, but they are slightly different in style.

• Tớ đồng ý hủy kế hoạch. = more direct, natural, conversational
• Tớ đồng ý với việc hủy kế hoạch. = I agree with the cancellation of the plan / I agree with canceling the plan

The version with với việc sounds more formal or more abstract. In everyday speech, the shorter sentence is often preferred.

Both can relate to stopping a plan, but they are not exactly the same.

• hủy kế hoạch = cancel the plan
  This is the most direct and standard way to say it.

• bỏ kế hoạch = drop the plan / abandon the plan
  This can sound more like giving up on it rather than formally canceling it.

So if you want a clean equivalent of English cancel the plan, hủy kế hoạch is usually the best choice.

The main change would usually be the pronoun.

Informal:

• Tớ đồng ý hủy kế hoạch.

More neutral/formal:

• Tôi đồng ý hủy kế hoạch.

If speaking very politely in a business setting, tôi is much safer than tớ.

A rough pronunciation guide is:

• Tớ ≈ tuh with a short clipped vowel and a rising glottalized tone
• đồng ý ≈ dohng ee
• hủy ≈ roughly hoo-ee said as one syllable with a dipping-rising tone
• kế hoạch ≈ kay hwak (very approximate)

A more useful learner tip is the rhythm:

• Tớ | đồng ý | hủy kế hoạch

Vietnamese tones are very important, so it is best to learn the words with audio if possible rather than relying too much on English spelling.

Usually, no. That sounds unnatural in this sentence.

After đồng ý, you normally go straight to the verb or clause:

• Tớ đồng ý hủy kế hoạch.

You might see đồng ý là... in other structures or less direct speech, but for this meaning, the simple form without là is the natural choice.