Inversion and Subject-Verb Agreement

They raised the price and reduced the amount in the packet.

>> Not (a)   raise the price but they reduced the amount in the packet.

I have never seen anything like it.

>> Never (a)   like

There has never been so much interest in mental health before.

>> Never before (a)   so much interest in mental health.

They didn't tell us until the decision was confirmed.

>> Only when the decision was confirmed (a)   us.

There has never been such a good time to do this.

>> Never before (a)   such a good time to do this.

The second reason why mobile phones are the most beneficial invention in the last 100 years (a)   that they can make life easier and more convenient.

Mobile phones (a)   many useful tools and features such as a camera, web search function, a clock, a calculator, and a music player. For instance, many use their mobile phones to conduct their business.

In Japan, a majority of people (a)   their salary by writing their blogs. Since one’s blog has a large influence on its viewers’ opinions and shopping habits, sponsors want to put their advertisements on blogs.

Some bloggers (a)   to get many advertisements from sponsors in order to earn advertising expenses.

In this kind of business, working from mobile phones (a)   a very important role as most bloggers use them to take pictures and write sentences and post those on their blogs. Mobile phones provide people with a new opportunity to earn money.