Solíamos estudiar el ritmo biológico, lo que es fascinante.

Questions & Answers about Solíamos estudiar el ritmo biológico, lo que es fascinante.

Why is biológico placed after ritmo, and could we ever put it before the noun?
Biológico is a relational adjective, meaning it categorizes the noun into a specific type (a rhythm related to biology) rather than describing a subjective quality. A strict rule for relational adjectives is that they must always go after the noun. You cannot say el biológico ritmo.
Could we say el ritmo muy biológico if the biological connection is very strong?
No, you cannot. Another key syntactic constraint of relational adjectives like biológico is that they cannot be modified by adverbs of degree such as muy (very) or bastante (quite). Something is either biological or it is not; it cannot be 'very biological'.
Why does the sentence use lo que instead of just que for 'which'?
In this sentence, lo que refers back to the entire preceding clause (the whole experience of studying the biological rhythm), not just a specific noun. If you used que, it would refer strictly to el ritmo biológico, meaning the rhythm itself is fascinating, rather than the overall act of studying it.
Why is the verb soler conjugated in the imperfect tense (solíamos) rather than the preterite?
The verb soler means 'to be in the habit of' or 'to usually do'. Because habits and routines are inherently ongoing over an undefined period of time, this verb is almost exclusively used in the imperfect tense when talking about the past. Using solíamos translates smoothly to 'we used to'.

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