Are these sentences natural? April 23

[musicgold]

Hi,

Are the following sentences natural to a native ear?

1. Wow, I could have sworn that it was real. ( was talking about a fake snake)

2. I am struggling to solve the following problem with simulation.

3. How much does it cost, on average, to convert a free parking lot to paid parking?

Thanks,
MG

[musicgold]

Anybody?

[BobSmith]

[AmE - not a teacher]

All of them sound great, except "with simulation" in 2. You might try:

I am struggling to solve the following problem by using a/the simulation. (The simulation will help fix the problem.)
I am struggling to solve the following problem with the simulation. (The simulation is broken.)