There is = hay
There are = hay
How many = cuanto
cuanto hay(singular) cuantos hay (plural)
How many books are there = cunatos libros hay?
How much ? cuanto cuesta - you use it to now how much something cost
It is - Este es
when? = cuando? example - when is your birthday? cuando es tu cumpleanos?
I have been... - Estuve (el verbo estar - to be somewhere)
I will be... Estare - I will be somewhere