Cuando tengo poco tiempo, la mejor opción es hacer un ejercicio corto.

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Breakdown of Cuando tengo poco tiempo, la mejor opción es hacer un ejercicio corto.

• tener: to have
• un: a
• ser: to be

Questions & Answers about Cuando tengo poco tiempo, la mejor opción es hacer un ejercicio corto.

Why is tengo in the present tense after cuando, instead of a future tense or the subjunctive?

In Spanish, after cuando you normally use:

• Present indicative (as here: tengo) when talking about habitual situations or general truths.
• Present subjunctive after cuando only when talking about a future event that is uncertain or not yet realized, usually in combination with a main clause in the future, imperative, or similar.

In this sentence:

• Cuando tengo poco tiempo, la mejor opción es hacer un ejercicio corto.
  → Describes a general, repeated situation: Whenever I have little time, the best option is to do a short exercise.

So tengo (present indicative) is correct.

If you were talking about a specific future situation, you would still often use the present indicative in Spanish (even though English uses the future):

• Cuando tenga poco tiempo, haré un ejercicio corto. – uses subjunctive tenga, future haré → more like “When I have little time (on that future occasion), I will do a short exercise.”

Here the sentence is clearly habitual, so tengo is the natural choice.

What is the difference between poco tiempo and un poco de tiempo?