ue

In a sentence

• La rue où j'habite est calme.

  The street where I live is quiet.

  In this sentence, "où" is a relative pronoun introducing a subordinate clause, expressing place.

• Je doute qu'il réussisse cette épreuve.

  I doubt that he will pass this test.

  Here, "que" introduces a dependent clause, used after verbs of doubt or emotions in subjunctive sentences.

• Il faut que tu viennes.

  It is necessary that you come.

  In this example, "que" functions as a conjunction indicating a necessity or obligation, followed by a subjunctive mood.