1.Do you know how expensive was it ?

2.Do you know how expensive it was?

1.Do you remember how long time ago it was?

2.Do you remember how long time ago was it?

1.I don't understand why were they absent .

2.I don't understand why they were absent .

1.Tell me how was the exam.

2.Tell me how the exam was.

1.Tell me how can I do it.

2.Tell me how I can do it.

1.Do you see what problems it can bring ?

2.Do you see what problems can it bring?

1.Tell me what other things can I do.

2.Tell me what other things I can do.

1.I know why it must happen.

2.I know why must it happen.

1.I see why he must work more .

2.I see why must he work more .

1.I need to know what must I prepare .

2.I need to know what I must prepare .

a

an

Their

There

Them

They

1.inhappy

2.unhappy.

1.unregular

2.irregular

1.impatient

2.unpatient

1.inable

2.unable

1.I don't know why is it happening.

2.I don't know why it's happening.

1.I need to know what I must prepare.

2.I need to know what must I prepare.

1.Do you know where he lives ?

2.Do you know where does he live?

1.Do you know why was she so angry?

2.Do you know why she was so angry?

1.for

2.about