1. Inflation continues. There has been no deflation for one year.
"I hoped that deflation would stop,but not in this way. This inflation comes from the increasing price of petroleum."
2. I want to speed up the process of learning English,but cannot. Being a beginner,I know nothing about this language.
3. The runners sped smoothly around the bend,but he just slowed down and stopped. He was too tired to keep running.
4. The car accelerated to overtake me. I just slowed down to avoid hitting it.
5. Below me was nothing but a black void. I did not know what to do. I just hoped that it
be a nightmare from which I might awake. ("be" is subjunctive mood)
6. The void left by his death was never filled.
My heart was torn. After crying too much,I fell sick.
Use periods, not semicolons to end sentences.
Be careful with the word "accelerate". Almost nobody, other than a few economists and mathematicians, understands what it means. For that reason it is not safe use this word in an Economics context. Almost no reporter understand the meaning of the word. That is one reason why it might be impossible to understand articles you might read about inflation.
If you plot price vs. time, the slope of the graph is the inflation or deflation rate. Mathematically, "inflation" and "deflation" are the same thing, the only difference being that the former word is used when the slope is positive and the latter is used the slope is negative.
Price acceleration is the second derivative of price vs. time. It is a rate of change of a rate of change. Only people who have studied a little bit of calculus understand this.
"Prices are rising" = "rate of change of price (=inflation) is positive". Commonly, this is what economists mean when they say "there is inflation".