Hebrew expressions

[pc2]

salutations,

we study Hebrew, and we noticed that there are some expressions that we don't know how to say.

for example, the Hebrew verb tenses are very simple - perfect and imperfect for Biblical, and present, past and future for Modern.

we would like to know how to express, in Hebrew, these verbs:

"to have to", as in "I will do what I have to do" (Modern and Biblical, if possible).
"would", as in "I would like to eat something".
"to be going to", as in "I was going to sleep".

who can, translate these phrases to Biblical and Modern, if possible.
if not, only one of them.

T. I. A.,