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興味のある内容で学習しましょう this is the title of original text where I pick up the
sentence to give better understanding of what is said.

The sentence is:

> 興味のある事 **だと** 、あなたは一生懸命に理解しよう **と** 努めるでしょう。

I know that と can mean "and", "with", "when A happens B also happens". What do
だと and と mean in this sentence?
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question
grammar meaning translation particles sentence
Function of だと and と in this sentence: 興味のある事だと、あなたは一生懸命に理解しようと努めるでしょう。
The first だと is actually two words, だ ("is", the copula) and a conditional-と.
That is, ～だと means "if [something] is ～...". See [Differences among -たら, なら,
-と, -んだったら, -ば, etc](https://japanese.stackexchange.com/q/393/5010) and [How
Conditionals Work in Japanese: …と, …ば, …たら, and …なら](https://www.wasabi-
jpn.com/japanese-grammar/how-conditionals-work/).

The first half of the sentence can be broken down like this:

  * 興味がある  
to be interested (more literally, "you have an interest" or "there is an
interest")

  * 興味のある **事**  
**something** you are interested in  
(a relative clause with [ga-no
conversion](https://japanese.stackexchange.com/q/12825/5010))

  * 興味のある事 **だ**  
(That) **is** something you are interested in.

  * 興味のある事だ **と** 、...  
**If** that is something you are interested in, ...

* * *

The second と is part of the ～ようと(する) construction, which means "to try to ～".
See [Volitional + と + Verb](https://japanese.stackexchange.com/q/9688/5010)
and [What is the difference between "verb＋て＋みる" and
"verb＋(よ)う+とする"?](https://japanese.stackexchange.com/q/19038/5010). (と by
itself is a [marker for the content of an
action](https://japanese.stackexchange.com/a/68132/5010), but you have to
memorize -ようと as a set phrase first.) Thus the last half of the sentence
means:

  * ...あなたは一生懸命に理解 **しようと** 努めるでしょう。  
...you will strive hard **trying to understand** it.  
...you will strive hard **in order to understand** it.
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answer