A Myriad of Grammar Problems...

I have absolutely no idea how to do these, can someone tell me what's going on here, Ive looked up many pages on the web but still am stumped on these:
Exercise 9Rewrite the following in the
PASSIVE voice.
E.g. 1. My wife wrote the letter. --> The letter was written by my wife.
2. My father painted the house. --> The house was painted by my father.
3. The storm will destroy the harvest. --> The harvest will be destroyed by the storm.
4. He has knocked the fence over. --> The fence was knocked over by him.
5. The man in the black hat found the child. --> The child was found by the man in the black hat.
Exercise 10Rewrite the following in the
ACTIVE voice.
E.g. 1. This task can be done by small children. --> Small children can do this task.
2. The supermarket will be opened by the mayor. --> The mayor will open the supermarket.
3. The charge was made by the police. --> The police made the charge.
4. The drawings were done by a famous artist. --> A famous artist did the drawings.
5. The company has been taken over by the Government. --> The government was taken over the company.
Are these right, I have to get them 100% word correct...but I'm really not sure if their right.
For example, we can use the present continuous (also used to refer to the future when we make arrangements) to talk about what is happening now. The simple present is commonly used to refer to routines or habits and it can also be used to refer past and future events.
Exercise 1Look at this example taken from a newspaper:
'Prime Minister unveils new policies'. Although it is written in the present tense, it refers to past time.
Look at the following sentences using present simple tense verbs and decide what time reference they have -
PRESENT,
PAST, or
FUTURE.
| E.g. 1. When you see her, will you say hello from me. | Future |
| 2. Cantona passes to Giggs, who passes to Sharp. |
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| 3. She walks in, comes right up to me and says... |
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| 4. The train leaves at 10.30. |
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| 5. We'll phone as soon as we get there. |
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Number 2,3 I said was Present, and Number,4,5 I said was Future.
Exercise 2Look through the following sentences and select the
TENSE and the time reference used.
| E.g. 1. If I won a lot of money, I'd travel the world. | Past Simple | Future |
| 2. I wish I had more time to finish this exercise. |
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| 3. When you have finished, you can go home. |
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| 4. 'Major calls for peace summit' (headline). |
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| 5. I'm meeting some friends at the pub tonight. |
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| 6. We've got the next lesson in the language library. |
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| 7. I am to give a speech at the conference next week. |
I have NO IDEA how to do the above 2 exercises, I can't even attempt them very well...can anyone relieve me of the stress I'm having with these?