Talk means say something to a single person. But Speak means say something to a group

s and es are commonly used for makes singular or plural of a word. If we uses s or es with noun's that make plural word. Eg: Apple(singular) ,Apples(Plural). But we use s or es with verbs that makes singular. Eg: Sing(plural),Sings(singular).

What is the name of your city?

one thing happend at this time in future

how we can use will/shall?

for is used to show a period of time. Eg. i live here for 3 years