Do use the subjunctive when you're describing your attitude towards something factual, or a fact relating to someone, provided that…
1. There are two verbs in the sentence, with a “que” in between them. ...
The 'person' of the first verb is different to the 'person' of the second verb.
-I demand a car!
1. I demand that you respect me!
2. subject + volition verb + "que" + different subject + subjunctive verb
3. Yo insisto en que ella se vaya
4. Él recomienda que comamos bien
5. Es necesario que tú hagas tu tarea
6. Yo sé que tú haces tu tarea
Therefore it's known as a noun clause. There are three reasons we would use the subjunctive in a noun clause: volition, doubt/negation, and emotion.
<span>Early one Saturday morning, (6) a fisherman and his (7) son went fishing. Since fishermen do not like to talk (8) a lot, (9) the men in our story were as quiet as the (10) fish. (11) Only at noon, when the clouds appeared on the horizon, the son said to the father: "It seems like it will rain." (12) The father looked up at the sky and nodded. But he did not say a word. (13) One day it happened that way. On Sunday they took a break. But as usual, nothing was said. On Monday they went fishing again, but still in (14) silence. So they went on Tuesday, Wednesday, Thursday, and Friday, everyone went the same way. It was not until Friday evening, when it started raining hard, that the father wiped his forehead with his hand and said, "Yes, you're right</span>
