Ich denke, dass es morgen regnet.
English: I think that it will rain tomorrow.
In German, 'Nebensätze mit dass' are subordinate clauses that start with 'dass' and give extra information, often explaining what someone says, thinks, or feels.
Use 'dass'-clauses in German to report what someone says, thinks, knows, or feels. They often follow verbs like sagen, glauben, wissen, meinen, hoffen.
Ich denke, dass es morgen regnet.
English: I think that it will rain tomorrow.
Sie sagt, dass sie müde ist.
English: She says that she is tired.
Wir hoffen, dass du kommst.
English: We hope that you come.
Er weiß, dass ich Deutsch lerne.
English: He knows that I am learning German.