Are both sentences OK?
(in the storm)
We're lucky that the boat hasn't sunk.
We're lucky that the boat hasn't sunken.And these;
Pull your car as close as possible.
Pull your car as far as possible.
Pull your car as far forward as possible.

Question

Are both sentences OK?
(in the storm)
We're lucky that the boat hasn't sunk.
We're lucky that the boat hasn't sunken.And these;
Pull your car as close as possible.
Pull your car as far as possible.
Pull your car as far forward as possible.

Answer

1 hasn't sunk
2 I would use "push". A car is too heavy to pull; it can be "towed" , which is to pull by means of another vehicle. The phrases you wrote are for me a little awkward without context, though they are correct grammatically. They could use some changes. Push your car as close to the curb as possible, for example.