Questions & Answers about Sin duda vendrá mañana.
Why does this sentence use the indicative vendrá instead of the subjunctive, since we are learning about phrases of doubt?
Because sin duda means without a doubt, it expresses certainty rather than doubt. Expressions that declare what you believe to be a fact always trigger the indicative mood. If you wanted to express actual doubt, you would use a phrase like tal vez or quizás followed by the subjunctive, as in Tal vez venga mañana.
Could I use the present tense viene instead of the future tense vendrá here?
Yes! In Spanish, you can frequently use the present indicative to talk about scheduled or highly certain future events. Saying Sin duda viene mañana is perfectly natural and means the same thing.
How do we know it means he will come just from the word vendrá?
Vendrá is the third-person singular future tense of venir, so it could mean he, she, it, or the formal you (usted). The English translation uses he based on an implied context. If you needed to clarify who was coming, you would add the subject pronoun: Él sin duda vendrá mañana.
Does sin duda have to go at the very beginning of the sentence?
No, Spanish word order is quite flexible. You could also say Vendrá mañana sin duda or even Vendrá sin duda mañana. Placing it at the beginning simply emphasizes the speaker's certainty right off the bat.
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