tense to theek hai lekin ye sawal kya hai,

tum sachmuch achhe dost ho. god bless u is not directly used in Hindi this way. so a Hindi person will find it too formal if you say the transliteration. though i am giving a rough translation for it ishwar tumhe ish de. shukreya =dhanyawad.

bus has many uses in Hindi. bus means enough /stop now /thats all /only /just depending on the context. bus karo = stop that. bus bus= no more please bus itna hi likha hai= only this much is written. bus paas hi hai= its just nearby one more thing bus is also the bus (transport)of English in conversational Hindi. kasam se = swear or oath

i want ice-cream.

aap kaise hain? is absolutely correct. formal talks always use this. this is honorific. when you are asking this to many people this is correct as well. tum kaise ho is used with friends acquaintences. aap kaise ho . is not correct grammatically.

good morning is translated with shubh prabhat . but there is no custom in Hindi to wish good morning instead we start with namaste. which means i bow to you. so if this is not for translation start with namste instead of shubh prabhat. how can i help you? is translated as main apki kya madad kar sakta hun? (literally it is I yours what help do can is?) remember it is not how it is what. who is calling? this is in response to phone call usually so in that case you say kaun baat kar rahe hain? if the person calling is male and kaun baat kar rahi hain? in case of a lady calling. remember that n in hain and hun are nasalized like french un .

i am ready to teach you Hindi . Hindi is my native language.