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間に合うだろう

will probably make it in time

→ 間に合う
phrase Uncommon #12,138
will probably make it in time 間に合う means “to be in time” or “to make it,” while だろう expresses probability or expectation. The polite equivalent is でしょう.
JA: 急げば、映画に間に合うだろう。
EN: If we hurry, we’ll probably make it to the movie in time.

急ぎなさい、そうすれば間に合うだろう。

Hurry up, and you'll make it in time.

すぐに出発すれば汽車に間に合うだろう。

If we leave right away, we should catch the train.

すぐ出発すれば間に合うだろう。

If we leave right away, we'll make it.

まあ当分はそれで間に合うだろう。

Well, that should do for the time being.

当分これで間に合うだろう。

This should do for the time being.