Infinitive verb..........
If you interpolate "que" after a conjugated verb, does the ensuing verb have to be in an infinitive state?
For instance "pensé que supiste " should it be "pensé que saber" ?
Thank You
6 Answers
If you interpolate "que" after a conjugated verb, does the ensuing verb have to be in an infinitive state? The infinitive is the verbal form you look for in a dictionary.
The correct terminology, if you want to know, is "...the ensuing verb in infinitive?"
The question has already been answered: you use "que" to introduce finite verbs (verbs that are not in infinitive or participle), such as "supiste".
"pensé que supiste " is correct.
I don´t know of any convenient rule that tells you what to use after "que," but you never know. There just might be one lying around in a dusty chamber of the RAE.
From my own limited experience, I think that it is fair to say that a relative pronoun is generally followed by a conjugated (finite) verb.
?Pienso que tienes razón.
?No creo que tengas razón.
On the other hand, there are also a handful of idiomatic expressions and verb phrases that do indeed follow the relative pronoun "que" with an infinitive:
?Hay que decir algo.
?Creo que tiene que ver con la gramática.
?Pero tengo que esperar a que alguien más hábil conteste.
?Es que equivocarme* siempre me da que sentir.
* To be fair, "equivocarme" is actually used as a verbal noun in this instance.
In any case, the key is to regularly expose yourself to as much Spanish (verbal and written) as possible. With a little time and experience you should start to develop a somewhat intuitive feel for the pattern and structure of the language, including the various idiomatic expressions.
It depends what you say.
Espero que tenga un buen día.
This time, I used a conjugated tener in subjunctive mood.
No! That's the beauty of the word "que".
Both are wrong.
What's wrong with "insert"? 
