Would you mind to talk about active and passive voice?

We usually try to write in active voice because it’s easier to understand.
In the active voice the subject ‘does’ the action:
Notice how the subject in these examples is 'doing' the verb's action.
'The boy ate the cake.' [The boy is the subject and he is doing the eating]
'The girl kicks the ball.'
'I wrote the essay.'
But in passive voice the action is performed 'on' the subject. So we can say the subject is 'acted on.'
'The cake was eaten by the boy.' [The cake is the subject and it is acted upon]
'The ball is kicked by the girl.'
'The essay was written by me.'
What is the difference between pain, hurt, relief and relieve, glad, please and happy? Thank you for the answer.

The noun ‘pain’ refers to an unpleasant physical sensation caused by an injury or sickness.
‘I have a pain in my stomach.’
‘Do you feel any pain when I touch you?’
‘The pain was so bad I had to go to hospital.’
‘Hurt’ is a verb describing the act of feeling pain.
‘My leg hurts.’
‘Show me where it hurts.’
‘I hurt it when I fell off my bike.’
'Relief' is a noun, it refers to the good feeling you get when something bad has stopped, or has not happened.
‘What a relief, my leg has finally stopped hurting.’
‘It is a relief to know you are feeling better. I was very worried.’
'Relieve' is a verb, it describes the act of making something painful or unpleasant go away, or feel better.
‘The medication relieved my pain.’
‘I am relieved to see that you are healthy.’
'Pleasure' is a noun. It refers to a happy feeling.
‘Being here with you gives me great pleasure.’
‘What a pleasure it is to spend a day by the beach.’
'Glad' is an adjective that describes a good feeling of pleasure and happiness.
‘I’m glad you are feeling better today.’
‘I’m glad the school year is almost finished.’
‘I’m glad I can spend the weekend with my family.’
'Happy' is an adjective.
‘I am so happy to see you.’
‘I feel happy to know you are feeling better.’

How to use 'as is' properly?
As is' is a short way of saying 'as it is.'
We use in mainly when talking about buying a second-hand, or used, item. It means you will have to accept the item 'as it is', including any problems it has.
'I'll give it to you for $100, as is.'
‘You can buy the dress for $5 but it does have a hole in it, so you’ll have to take it as is.’

Could you please explain the phrase 'To beg the question'?
Most people use ‘beg the question’ to mean ‘pose the question’ or ‘forces me to ask the question.’
‘He said he wasn’t home when I knocked on the door. Which begs the question: Where was he?’
But many people who study logic argue that this meaning is not strictly correct. It originally comes from the Latin petitio principii, which means ‘assuming the initial point.’
Strictly, it refers to ‘circular reasoning’; when your only proof for an argument assumes the argument is true. Here are some examples of arguments that would be called 'begging the question':
‘Ghost are real because I have seen them.’
‘The reason these hats are so popular is because everybody wants them.’But remember that in everyday speech you are most likely to hear the more common use of 'that begs the question,' to mean 'that forces me to ask the question.'

Both ‘further’ and ‘farther’ are used to mean ‘a greater distance.’
Farther refers to actual, physical distances.
‘It was a lot farther than I expected, and I had not planned to walk in my good shoes.’
‘How much farther?’
'Further' is used for metaphorical distances. Note how in these sentences we are talking about the idea of distance, but not actual, physical distances that can be measured:
‘I do not want to talk about this any further.’
‘I can’t believe you said I was selfish. Nothing could be further from the truth.’
These days it is more and more common for people to use ‘further’ in both cases, and ‘farther’ is becoming much less common.