الفرق بين Should و have to

( Should )

You should do something = It's a good thing to do, it's the right thing to do.

Examples :

1) Tom doesn't study enough. He should study harder.

2) It's a good film, you should go and see it.

________

( have to )

I have to do something = it's a necessary for me to do it, I'm obliged to do it.

Examples :

1) I will be late for work tomorrow. I have to go to the dentist.

2) Jane starts work at 7 o'clock, so she has to get up at 6 o'clock.

الخلاصة :
نستخدم should اذا كان الشيء المراد فعله ليس شيء ضروري ولا الزامي، وانما من الجيد أن تقوم به .

أما بالنسبة ل have to فتستخدم عندما يكون الشيء ضروري والزامي.

قاعدة هامة :
الفعل دائماً بعد should و have to يأتي في المصدر ( infinitive )