Is the sequence -んだと missing?


I found this sentence in a textbook:

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    来月までには出来あがらないと思います。
    
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It was translated as _" I think that we'll not make it until next month"_.

But the と particle after the negated verb is confusing me. I thought that
出来あがらないと should mean _" If we don't make it, then..."_.

If I understood correctly the ability of the -のだと- sequence to connect complex
clauses to verbs such as 思う and 信じる, I would personally say "来月までには出来あがらない
**んだと** 思います".

So, is my alternative right, or wrong? Plus, am I missing some usage about the
と particle? Perhaps before 思う it does not translate as "then", but as a "that"
related to the preceding clause?




This と is something like a content's marker like "that". Of course, と is used
as the conditional such as 来月までには出来あがらないと上司に怒られる.

Your translation for the example is unnatural. -のだ思う is usually used for
other's action, not ownself. For example, 彼は明日、会社を辞めるんだと思う is natural, but
私は明日、会社を辞めるんだと思う is unnatural. We say simply 私は明日、会社を辞めると思う. If the example is
"I think that they'll not make it until next month", your translation is good.




This と is something like a content's marker like "that". Of course, と is used
as the conditional such as 来月までには出来あがらないと上司に怒られる.

Your translation for the example is unnatural. -のだ思う is usually used for
other's action, not ownself. For example, 彼は明日、会社を辞めるんだと思う is natural, but
私は明日、会社を辞めるんだと思う is unnatural. We say simply 私は明日、会社を辞めると思う. If the example is
"I think that they'll not make it until next month", your translation is good.

