Which sentence is correct?

Which sentence is correct?

1. I have been cleaning the flat at least three hours, when my mother arrived.
2. I had been cleaning the flat at least three hours, when my mother arrived.
3. I have been cleaning the flat at least three hours, when my mother has arrived.
4. I had been cleaning the flat at least three hours, when my mother will have arrived.

Which sentence is correct?

1. She asked how he had done it.
2. She asked how he has done it.
3. She asked how he did it.
4. She asked how he had do it.

Which sentence is correct?

1. I have came.
2. Have you have your lunch yet?
3. I have never been in Yugoslavia.
4. They have just finish their work.

Which sentence is correct?

1. Going where you like, I do not mind.
2. Go where you like, I do not mind.
3. Go otherwise you like, I do not mind.
4. Go that you like, I do not mind.

Which sentence is correct?

1. A year from now you will be finished this work.
2. A year from now you will have forget this work.
3. By this time tomorrow you have forgotten this work.
4. By this time tomorrow you will have finished this work.

Which sentence is correct?

1. I cannot help from feeling sorry for him.
2. I cannot help to feel sorry for him.
3. I cannot help feeling sorry for him.
4. I cannot help feel sorry for him.

Which sentence is correct?

1. Everest is the higher period in the world.
2. Everest is the higher mountain in the world.
3. Everest is more highest than a hill.
4. Everest is the highest mountain in the world.

Which sentence is correct?

1. I saw the film the day before yesterday. I did not see it before.
2. I saw the film the day before yesterday. I had not seen it before.
3. I have seen the film the day before yesterday. I see it before.
4. I saw the film the day before yesterday. I have not seen it before.

Which sentence is correct?

1. Would you like a cigarette?
2. Do you like a cigarette?.
3. I like a book of stamps, please.
4. I have like a book of stamps, please.

Which sentence is correct?

1. It's no good in waiting for him, because he never comes.
2. It's no good waiting for him, because he never comes.
3. It's no good from waiting for him, because he never to come.
4. It's no good wait for him, because he never comes.