The use of Light as a verb, are theu correct
Light a fire, a candle, a cigarette, a bonfire
I threw a match and the bonfire light/lighted up (which is correct?)
I lighted up a room with a lamp
A lamp can light a room
Her face lighted up wnen I showed her new house

Are they all correct? (Would you like to give me some comments about difference between light and light up please?)

Thank you

Question

The use of Light as a verb, are theu correct
Light a fire, a candle, a cigarette, a bonfire
I threw a match and the bonfire light/lighted up (which is correct?)
I lighted up a room with a lamp 
A lamp can light a room
Her face lighted up wnen I showed her new house

Are they all correct? (Would you like to give me some comments about difference between light and light up please?)

Thank you

Answer

I think that many years ago, there was a song in which the singer said, "You light up my life."

That is, you brighten my life.

"Brighten" my life could be interpreted as:

a.. I was in darkness because I was lonely. When I met you, it was like turning on the lights. I am no longer lonely.

b. I was in darkness because I was ignorant about life.  When I met you, it was like turning on the lights. I have learned the truth about life from you.

Answer

These days you should use 'lit' in all of them except the 'a lamp can light a room' sentence which is fine but 'light up' is more common in this case. Lighted is correct but old fashioned at this point.

Answer

haha! lit! past tense conjugation is lit.

(1) and (2) are both lit, past tense - bonfire lit up, I lit up the room
(4) her fact lit up

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