His computer is working correctly.
Is his computer working correctly?

The USB cable is broken.
Is the USB cable broken?

She must download that file.
Must she download that file?

This laptop has got a virus.
Has this laptop got a virus?
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They use the Internet for their school projects.
Do they use the Internet for their school projects?

She knows how to install the program.
Does she know how to install the program?

Bob's sister designs web pages.
Does Bob's sister design web pages?

They installed this program last month.
Did they install this program last month?

We have to configure the network access.
Do we have to configure the network access?

His computer broke down on Tuesday.
Did his computer break down on Tuesday?

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This sound card costs £ 99.
Does this sound card cost £ 99?

This wireless mouse cost £ 39.
Did this wireless mouse cost £ 39?

These wireless keyboards cost £ 59 a month ago.
Did these wireless keyboards cost £ 59 a month ago?

These scanners are on offer. They cost £ 129.
Are these scanners on offer? Do they cost £ 129?

These graphic cards tend to cost around £ 49.
Do these graphic cards tend to cost around £ 49?