Croire

 Here are example sentences for croire in all your requested tenses, with English translations.

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Présent (I believe, You believe, He/She believes, etc.)

Je crois que c'est une bonne idée. → I believe that it's a good idea.

Tu crois en la magie ? → Do you believe in magic?

Il croit que tout est possible. → He believes that anything is possible.

Nous croyons en l'importance de l'éducation. → We believe in the importance of education.

Vous croyez en Dieu ? → Do you believe in God?

Elles croient que les choses vont s'améliorer. → They believe that things will improve.

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Imparfait (I was believing, You were believing, He/She was believing, etc.)

Je croyais qu'il allait venir. → I was believing that he was going to come.

Tu croyais que ce film serait intéressant. → You were believing that the movie would be interesting.

Il croyait en la réincarnation. → He was believing in reincarnation.

Nous croyions que tout allait bien. → We were believing that everything was fine.

Vous croyiez que cette décision était la meilleure. → You were believing that this decision was the best.

Elles croyaient qu'elles avaient gagné. → They were believing that they had won.

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Futur Simple (I will believe, You will believe, He/She will believe, etc.)

Je croirai en toi, peu importe ce qui se passe. → I will believe in you, no matter what happens.

Tu croiras que tout va bien se passer. → You will believe that everything will go well.

Il croira en ses rêves. → He will believe in his dreams.

Nous croirons en l'avenir de nos enfants. → We will believe in the future of our children.

Vous croirez que j'avais raison. → You will believe that I was right.

Elles croiront qu'elles peuvent accomplir ce qu'elles veulent. → They will believe that they can accomplish whatever they want.

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Passé Simple (I believed, You believed, He/She believed, etc.) [Mostly literary]

Je crus que tout était perdu. → I believed that everything was lost.

Tu crus en toi-même malgré les obstacles. → You believed in yourself despite the obstacles.

Il crut que ses efforts seraient récompensés. → He believed that his efforts would be rewarded.

Nous crûmes qu'il serait là à temps. → We believed that he would be there on time.

Vous crûtes en l'idée du changement. → You believed in the idea of change.

Elles crurent que tout était possible. → They believed that everything was possible.

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Passé Composé (I have believed, You have believed, He/She has believed, etc.)

J'ai cru que tu m'avais oublié. → I have believed that you had forgotten me.

Tu as cru que cela serait facile. → You have believed that it would be easy.

Il a cru en ses capacités. → He has believed in his abilities.

Nous avons cru en la justice. → We have believed in justice.

Vous avez cru que tout allait bien se passer. → You have believed that everything would go well.

Elles ont cru qu'elles avaient gagné la compétition. → They have believed that they had won the competition.

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Plus-que-parfait (I had believed, You had believed, He/She had believed, etc.)

J'avais cru que tu étais déjà parti. → I had believed that you had already left.

Tu avais cru en tes rêves quand tu étais jeune. → You had believed in your dreams when you were young.

Il avait cru qu'il était trop tard pour agir. → He had believed that it was too late to act.

Nous avions cru qu'il pleuvrait toute la journée. → We had believed that it would rain all day.

Vous aviez cru que vous gagneriez la course. → You had believed that you would win the race.

Elles avaient cru que l'examen serait facile. → They had believed that the exam would be easy.

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Conditionnel Passé (I would have believed, You would have believed, He/She would have believed, etc.)

J'aurais cru que tu serais arrivé plus tôt. → I would have believed that you would have arrived earlier.

Tu aurais cru en moi si tu m'avais écouté. → You would have believed in me if you had listened to me.

Il aurait cru que c'était un rêve si cela ne s'était pas produit. → He would have believed that it was a dream if it hadn't happened.

Nous aurions cru que tout allait bien se passer. → We would have believed that everything would go well.

Vous auriez cru que c'était une mauvaise idée. → You would have believed that it was a bad idea.

Elles auraient cru qu'elles avaient raison si elles n'avaient pas découvert la vérité. → They would have believed that they were right if they hadn't discovered the truth.

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Subjonctif Présent (That I believe, That you believe, That he/she believes, etc.)

Il est important que je croie en moi-même. → It is important that I believe in myself.

Je veux que tu croies en tes rêves. → I want you to believe in your dreams.

Il faut qu'il croie que tout est possible. → He needs to believe that everything is possible.

Nous espérons que vous croyez en l'avenir de notre projet. → We hope that you believe in the future of our project.

Il est possible que nous croyions à la même chose. → It is possible that we believe the same thing.

Je suis content qu'elles  croient en elles-mêmes. → I am happy that they believe in themselves.

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Let me know if you need further explanations or more examples!