FIRST CONDITIONALS

If my sister (not help) me immediately, I (go) somewhere
We (be) in a big trouble if (there not be) enough food for the guests to eat.
I (be) back here by ten p.m. tonight if the train (stop) in "smwhere"

If my sister does not help me immediately, I will go somewhere.

We will be in a big trouble if there is not enough food for the guests to eat.

I will be back here by ten p.m. tonight if the train stops in "somewhere"