Por un lado ganarás tiempo, pero por otro gastarás mucho.

Questions & Answers about Por un lado ganarás tiempo, pero por otro gastarás mucho.

Why is the word lado missing after por otro in this sentence?
In the structure por un lado... por otro lado (on the one hand... on the other hand), it is very common to drop the second lado to avoid repetition. Just like in English, you can simply say on the one hand... but on the other...
Do I always have to use pero before por otro?
No, you do not have to use pero, but it is very common when the two ideas directly contrast. You could just say Por un lado ganarás tiempo, por otro gastarás mucho, but adding pero makes the contrast feel stronger and flow more naturally.
A quick refresher: why do ganarás and gastarás have accents on the final syllable?
These verbs are in the future tense for the (you) form. In Spanish, the future tense is usually formed by taking the full infinitive verb (ganar, gastar) and adding the endings. For , the future ending is -ás, which always carries an accent mark.
Why does mucho not change to match anything here, like mucha or muchos?
Here, mucho is acting as an adverb describing how much you will spend (gastarás), rather than an adjective modifying a noun. When mucho modifies a verb, it means 'a lot' and always stays in this fixed masculine singular form.

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