I'm reading the JLPT N3 読む guide and the explanation for the conjunction ただ
says this:

> 前の文の内容 **と** 違うことがある **と** 付け加えて説明する。

Also, there's a section where the next sentence appears:

> 台風が接近しています。そのため、明日の旅行は中止 **と** なりました．

Why is と being used for this?
CC BY-SA 4.0
2019-09-12T00:08:51.597
71742
2020-07-27T15:36:53.277
2020-07-27T15:36:53.277
9831
34934
question
usage particle-と
Why is the particle と being used in the following sentences?
前の文の内容と - With the content of the previous sentence

**Noun + と - with(noun)**

**友達と - with friend**

違うことがあると - If there is a difference

**jisho + と - if(verb)**

**そこに行くとーIf you go there**

付け加えて説明する - Add explanation

前の文の内容と違うことがあると付け加えて説明する。

literally it means

If there is a difference With the content of the previous sentence Add
explanation
CC BY-SA 4.0
2019-09-12T12:00:26.507
71758
2019-09-12T12:00:26.507
35045
71742
answer
> 前の文の内容 **と** 違うことがある...

「～～ **と** 違う」 means "is different **from** ~~".

The と in ～と違う indicates 「比較・類別の際に照合される相手」(明鏡国語辞典) or 「比較の基準」([#3 in
デジタル大辞泉](https://dictionary.goo.ne.jp/jn/154670/meaning/m0u/)). It's used with
a word that expresses difference, similarity, identity, or comparison, such as
同じ, 違う, 異なる, 似る, 比べる, etc. Eg:

> ～ **と** 同じ -- is same **as** ~~  
>  ～ **と** 異なる -- differs **from** ~~  
>  ～ **と** 似ている -- is similar **to** ~~  
>  ～ **と** 比べる -- compare **with** ~~

Related thread: [How is と used in these
sentences?](https://japanese.stackexchange.com/q/57038/9831)

* * *

The と in ～と付け加えて説明する is quotative.

> 『前の文の内容と違うことがある』 **と** 付け加えて説明する。  
>  _lit._ (The word ただ is used to) additionally explain **that** there's
> something different from (something that deviates from / doesn't agree with)
> the content of the previous sentence.

* * *

> 明日の旅行は中止 **と** なりました。

～～となる (≂ ～～になる) means "become ~~." The と marks the result of change.

中止となりました means _lit._ "became cancellation" → "was cancelled"

Your example can be rephrased as 明日の旅行は中止になりました without changing the meaning.
中止 **と** なりました sounds a bit more formal than 中止 **に** なりました.

～となる and ～になる are not always interchangeable. For more, see: [What is the
difference between 〜となる and
〜になる?](https://japanese.stackexchange.com/a/739/9831)
CC BY-SA 4.0
2019-09-12T14:31:38.477
71761
2019-09-12T15:43:01.167
2019-09-12T15:43:01.167
9831
9831
71742
answer
**Disclaimer: regarding your second question only (please consider splitting
your question in two different ones).**

The following patterns are very similar an both mean "A becomes B":

> Aは B **に** なる
>
> Aは B **と** なる

The difference between them is that 「AはB **と** なる」 implies that **B is the
final state reached by A** , whereas 「AはB **に** なる」 does not.

For example:

> 昔はこの辺に畑がたくさんあったものだが、今はすっかり住宅地【じゅうたくち】 **と** なった。 Long ago, there were plenty
> of fields in this area. Now, it has completely turned into a residential
> district.

It is very unlikely that the area changes to a different kind of place in the
future, therefore it is its final state and となる is used.

Similarly, in the sentence of the question

> 明日の旅行は中止 **と** なりました。 The trip tomorrow has been cancelled.

the trip has been cancelled。Since 「 **と** なる」 is used, we can infer that the
possibility of uncancel the trip is very unlikely as "cancelled" is regarded
as the final state of the trip.
CC BY-SA 4.0
2019-09-13T06:12:11.247
71780
2019-09-14T14:42:42.353
2020-06-17T08:18:27.500
-1
32952
71742
answer