Usage Note
Probablemente typically triggers the subjunctive when it precedes the verb (probablemente llegue tarde), though the indicative is also common in informal speech. It is interchangeable with a lo mejor (no subjunctive) and quizás in most contexts.
Examples
"Probablemente llegue tarde esta noche."
Natural Translation
I will probably arrive late tonight.
Literal Translation
Probably I-arrive late this night

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