The main difference between "autant que" and "aussi que" is their usage in comparisons. "Autant que" is used to express equality in comparisons, meaning "as much as" or "as many as." For example, "Il mange autant que moi" (He eats as much as I do). On the other hand, "aussi que" is used to express similarity in comparisons, meaning "as... as." For example, "Elle est aussi belle que sa mère" (She is as beautiful as her mother). Therefore, "autant que" is used for equality, while "aussi que" is used for similarity in comparisons. **

"Hay que" and "tener que" both express the idea of necessity, but they are used in slightly different contexts. "Hay que" is used to express a general obligation or necessity, often referring to a rule, law, or social norm. For example, "Hay que estudiar para tener buenas notas" (One must study to get good grades). On the other hand, "tener que" is used to express a specific obligation or necessity that is related to a particular person or situation. For example, "Tengo que terminar este informe antes de la reunión" (I have to finish this report before the meeting). **

The subjunctive is used with "pienso que" when there is doubt, uncertainty, or subjectivity in the statement that follows. For example, "No pienso que venga a la fiesta" (I don't think he is coming to the party). In this case, the subjunctive "venga" is used because there is doubt about whether he will come. However, when there is certainty or a fact stated after "pienso que," the indicative mood is used. For example, "Pienso que ella viene a la fiesta" (I think she is coming to the party). **

"Tener que" is used when referring to a specific person or group of people who have an obligation or necessity to do something. For example, "Tengo que estudiar" (I have to study). On the other hand, "Hay que" is used when talking about a general obligation or necessity that applies to everyone. For example, "Hay que respetar las reglas" (One must respect the rules). So, the choice between "tener que" and "hay que" depends on whether the obligation is specific to an individual or more general. **

"Ce que" and "qui" are used in French to introduce relative clauses, while "nur que" and "qui" are used in German. In French, "ce que" is used to introduce a relative clause that functions as the direct object of the main clause, while "qui" is used to introduce a relative clause that functions as the subject of the main clause. In German, "nur que" is used to introduce a relative clause that functions as the direct object of the main clause, while "qui" is used to introduce a relative clause that functions as the subject of the main clause. **

The main difference between "ojalá que" and "espero que" in Spanish is the level of certainty or hope expressed. "Ojalá que" is used to express a wish or hope for something to happen, but with a sense of uncertainty or doubt about whether it will actually happen. On the other hand, "espero que" is used to express a hope or expectation for something to happen, with a stronger sense of confidence or belief that it will actually occur. In summary, "ojalá que" conveys a more uncertain hope, while "espero que" conveys a more confident hope. **

"Qu'est-ce que" means "what" in French and is used to form a question. For example, "Qu'est-ce que tu fais?" means "What are you doing?" On the other hand, "est-ce que" is a way to form a yes/no question in French. For example, "Est-ce que tu viens?" means "Are you coming?" **

In Spanish, "tienes que" and "hay que" both express the idea of "have to" or "must." "Tienes que" is used when the subject of the sentence is specified, indicating that someone specific has to do something. On the other hand, "hay que" is used when the subject is not specified, indicating that something must be done in general. For example, "Tienes que estudiar" means "You have to study," while "Hay que estudiar" means "One must study" or "It is necessary to study." **